What happens if both NAT-T and IPSec over UDP are enabled on the Concentrator and Client?

What happens if both NAT-T and IPSec over UDP are enabled on the Concentrator and Client?

A.
NAT-T takes precedence.

B.
User chooses which protocol takes precedence.

C.
IPSec over UDP takes precedence.

D.
An election occurs between the negotiating peers for which protocol takes precedence.