Under all FIDIC standard forms (Red, Yellow, and Silver Books, both 1999 and 2017 editions), the Contractor has a clear contractual obligation to notify the Employer (or the Engineer, depending on the form) if it discovers errors, faults, or defects in documents or instructions of a technical nature.
This obligation is explicitly stated in Sub-Clause 1.9 [Errors in the Employer's Requirements] (particularly in Yellow and Silver Books) and similarly reflected in provisions related to documents, drawings, and instructions in the Red Book. The Contractor is required to carefully examine the documents provided and promptly give notice upon identifying any discrepancies, ambiguities, or technical defects.
The purpose of this obligation is to ensure early detection and correction of design or specification issues, thereby minimizing delays, rework, and disputes. It also reflects the principle of cooperation and proactive risk management embedded in FIDIC contracts.
Failure by the Contractor to notify such errors may result in loss of entitlement to additional time or cost if the issue later impacts execution. Therefore, this notification duty is both a technical and contractual safeguard.
Thus, the statement is true, as FIDIC imposes a clear obligation on the Contractor to notify discovered technical errors or defects.

Option A is correct: The Engineer is entitled to receive evidence that the Contractor has paid for the necessary insurance policies.
Option C is correct: The Engineer has the role of monitoring the validity of these insurances and ensuring that renewals or extensions are arranged in a timely manner.
Option B is incorrect; the Engineer does not have the authority to take out insurance on behalf of the Contractor.
Option D is incorrect; suspension of construction activities is not automatically the Engineer's role for insurance lapses but may require instructions from the Employer.
References:
FIDIC Red, Yellow, Silver Books 2017 Edition, Sub-Clause 18 - Insurances FIDIC Contract Manager Study Guide, Module on Contract Administration and Insurance

Under FIDIC Yellow Book 1999, Sub-Clause 5.2 [Contractor's Documents] requires the Contractor to submit design documents to the Engineer for review. Importantly, the responsibility for planning and coordinating these submissions lies with the Contractor.
The Contractor must ensure that the programme (Clause 8.3) allows sufficient time for the Engineer's review process, including any resubmissions that may be required if documents are not approved initially. This reflects the design responsibility placed on the Contractor in the Yellow Book, where the Contractor controls both design and execution.
The Engineer's role is to review and respond within the time stated in the Contract, but the Engineer is not responsible for integrating this review time into the overall project schedule. Similarly, the Employer has no direct role in managing this timing.
From a contract management perspective, failure by the Contractor to allow adequate review time may lead to delays for which the Contractor bears responsibility, as such delays would not typically qualify for Extension of Time unless caused by the Engineer exceeding prescribed review periods.
Thus, proper programming and coordination of document submissions is a key Contractor obligation, making Option A correct.

Comprehensive and Detailed Explanation:
Option A is correct: Certification and payment of interim payments are conditional on Employer's receipt of the Contractor's appointment and the Advance Payment Guarantee (Sub-Clause 14.2.1).
Option D is correct: Payment also requires receipt of the Contractor's statement supported by relevant documentation.
Option B alone is insufficient without supporting documents.
Option C relates to appointment and performance security but is not a stated precondition for payment certification.
References:
FIDIC Silver Book 2017 Edition, Sub-Clause 14.6 - Interim Payment Certificates FIDIC Contract Manager Study Guide, Module on Payment Procedures

Comprehensive and Detailed Explanation:
Option A is NOT correct because the wording of the Letter of Tender is usually governed by the tender documents and contract terms; it is not solely at the Contractor's discretion to dictate when the Contract becomes effective. The standard process is that the Contract becomes effective upon the Employer's issuance of the Letter of Acceptance.
Options B, C, and D correctly describe standard FIDIC practices.
References:
FIDIC Red Book 1999 & 2017 Editions - Contract Formation and Tendering
FIDIC Contract Manager Study Guide, Module on Contract Formation