Y is not correct. The Contractor's obligation to commence works depends on the Commencement Date notification as per the contract. If the Employer requests commencement on the 14th day after signing, and the contract allows or the Engineer has not yet notified otherwise, the Contractor should comply unless formally instructed otherwise.
Delaying work beyond the contractual or Employer's instruction without valid cause may be considered breach of contract and could lead to claims against the Contractor.
References:
FIDIC Red, Yellow, and Silver Books 2017 Edition, Sub-Clause 8.1 - Commencement of Works FIDIC Contract Manager Study Guide, Module on Contract Formation and Execution

This statement is true. The FIDIC Yellow and Silver Books (2017 editions) include a clear provision that the Works, or the parts designed by the Contractor, must be fit for their ordinary purposes, reflecting the Contractor's responsibility for design and performance. This introduces an express fitness-for-purpose obligation, which was less explicit in earlier editions.
This provision clarifies risk allocation related to design liability, ensuring that the Contractor is accountable for the fitness of the designed works unless otherwise specified.
References:
FIDIC Yellow and Silver Books 2017 Edition, Sub-Clause 4.1 - Contractor's General Obligations FIDIC Contract Manager Study Guide, Module on Legal Obligations and Fitness for Purpose

The use of vague phrases such as "not used" in Particular Conditions to delete provisions of the General Conditions without replacement or explanation leads to ambiguity and unclear contractual obligations. Such drafting can cause confusion as it fails to clarify whether the deleted provisions are simply not applicable or replaced by other terms. This practice is discouraged because it creates legal uncertainty and possible disputes regarding the rights and responsibilities of the parties.
Option A exemplifies this problem, as it deletes General Conditions clauses without specifying alternatives or clarifications.
Option B is a good practice where deletions are replaced by well-defined clauses to maintain contract balance.
Option C describes a clear method of issuing clarifications, promoting transparency and traceability.
Option D is consistent with standard practice, where clarifications during tender are formalized by contract amendments.
References:
FIDIC Contract Manager Study Guide, Module on Contract Administration Procedures and Particular Conditions drafting FIDIC Red Book 2017 Guide notes on drafting Particular Conditions

Under FIDIC 2017 editions, the Performance Security protects the Employer against failure by the Contractor to fulfill contractual obligations. The Employer may claim under the Performance Security in the following cases:
Option A: Failure to renew the Tender Security as required during the tendering or contract formation phase can allow Employer to make a claim, since the security guarantees the Contractor's commitments at this stage.
Option E: Failure to extend the validity of the Performance Security when requested or required breaches contractual obligations and enables the Employer to claim under the security.
Option B is incorrect because abandonment without termination notice does not immediately entitle the Employer to claim under Performance Security; formal termination is usually required first.
Option C is incorrect because submitting a claim under Sub-Clause 20.2 (Employer's claims) does not directly correlate with claiming under Performance Security.
Option D is irrelevant; instructions to replace works do not relate to Performance Security claims.
References:
FIDIC Red, Yellow, and Silver Books 2017 Edition, Sub-Clause 4.2 - Performance Security FIDIC Contract Manager Study Guide, Module on Risk Management and Securities

Option B is correct: BIM is indeed a digital data technology applicable throughout the project lifecycle.
Option D is correct: Use of BIM requires careful consideration of contract clauses and appropriate adjustments in Particular Conditions.
Option A is incorrect; the 1999 edition does not mandate BIM use.
Option C is false; BIM improves quality, accuracy, delivery times, and cost efficiency.
References:
FIDIC Red Book 1999 & 2017 Editions - BIM and Contract Amendments
FIDIC Contract Manager Study Guide, Module on BIM and Digital Technologies