Which control flag should you use for 1dap1?

You domain’s security realm has two authentication provides :1dap1 and 1dap2.
Consider these requirements:
• If authentication succeeds with 1dap1, then skip 1dap2.
• If authentication fails with 1dap1, then authentication must succeed with 1dap2.

Which control flag should you use for 1dap1?

A.
Required

B.
Requisite

C.
Sufficient

D.
Optional