NEC4 ECC: Option A - can you use options X15 and X21 together?

We are putting together a contract ECC option A using the new NEC4 contract. The Client has specified that X21 is included and the contractor has requested X15. Can they both be included?

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NEC3 does not have X21, but NEC4 does. Please can you clarify what your X21 is for ?

The secondary options are: NEC4 X21 Whole Life Cost and X15 The Contractor’s design - there is no reason why these two secondary options cannot be used together.