* Option Ais correct: The Employer may sell or dispose of any items left by the Contractor and reinstate the Site, recovering costs from the Contractor.
* Option Cis correct: The Employer is entitled to recover costs for clearing, reinstatement, and disposal exceeding proceeds from sale.
* Option Bis incorrect; the Engineer does not hold this authority, but the Employer does under the contract.
* Option Dis incorrect; if the Contractor fails to clear the Site, the Employer may take action to protect the Site.
References:
FIDIC Red Book 2017 Edition, Sub-Clause 8.7 - Contractor's Use of Site
FIDIC Contract Manager Study Guide, Module on Contract Administration Procedures

Option B is correct: Deleting critical dispute resolution Sub-Clauses 20.2 - 20.4 contradicts the Golden Principles by undermining fair dispute handling.
Option D is correct: Extending payment release to 180 days violates timely payment principles and fairness in cash flow management.
Option A is generally acceptable as the Contractor often assumes responsibility for nominated subcontractors.
Option C is acceptable in some jurisdictions and contracts to provide finality but can be debated.
References:
FIDIC Contract Management Guidelines - Golden Principles
FIDIC Red Book 1999 Edition, Clauses 20 and 14

Option A is true: In emergencies, verbal notices are permitted with the requirement to follow up in writing.
Option D is true: Notices and communications may be sent in various formats including handwritten, typed, printed, or electronic systems.
Option B is incorrect; a notice does not necessarily have to be signed by all these representatives; it depends on the party issuing the notice.
Option C is incorrect; proof of receipt is ideal but not always strictly required for legal validity depending on contract provisions.
References:
FIDIC Red Book 1999 Edition, Sub-Clause 1.3 - Communications and Notices FIDIC Contract Manager Study Guide, Module on Contract Communication

Comprehensive and Detailed Explanation:
Option A is correct: The initial programme must include the date for the Contractor's access to the Site.
Option D is correct: Key delivery dates for Plant and Materials are essential elements of the programme.
Option B relates to updated/revised programmes, not the initial programme.
Option C generally relates to remedial work and is part of revised or detailed programmes.
References:
FIDIC Red and Yellow Books 2017 Edition, Sub-Clause 8.3 - Programme
FIDIC Contract Manager Study Guide, Module on Time and Delay Management

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