which configuration must be the exact reverse (mirror image) of the other IPsec peer?

When you configure a site-to-site IPsec VPN tunnel, which configuration must be the exact reverse (mirror image) of the other IPsec peer?

A.
IPsec transform set

B.
ISAKMP policy

C.
crypto ACL

D.
pre-shared key

E.
crypto map

F.
static route