Which three commands do you use to verify that IPSec over a GRE tunnel is working properly?

Which three commands do you use to verify that IPSec over a GRE tunnel is working properly? (Choose three.)
A. Clear Crypto isakmp
B. PPP encrypt mppe auto
C. Show crypto engine connections active
D. Show crypto ipsec sa
E. Show crypto isakmp sa
F. Debug crypto isakmp

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