Which statement is true about an IPsec/GRE tunnel?

A.
The GRE tunnel source and destination addresses arespecified within the IPsec
transform set.

B.
An IPsec/GRE tunnel must use IPsec tunnel mode.

C.
GRE encapsulation occurs before the IPsec encryption process.

D.
Crypto map ACL is not needed to match which trafficwill be protected.