Comprehensive and Detailed Explanation:
Options A and B are correct: Both the Red and Yellow Books require the Engineer to certify payments before the Employer pays the Contractor.
Option C (Silver Book) typically places the risk on the Contractor and often provides for payment without Engineer certification, reflecting the turnkey nature of the contract.
[References:, , FIDIC Red and Yellow Books 1999 & 2017 Editions, Clauses on Payment Certification, , FIDIC Silver Book 1999 & 2017 Editions – Payment Provisions, , FIDIC Contract Manager Study Guide, Module on Payment Procedures]
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