Which three statements about SCEP are true? (choose three)

A.
The certificate request format uses PKCS#10

B.
Cryptographically signed and encrypted message are conveyed using PKCS#7

C.
It supports multiple cryptographic algorithms including RSA

D.
CRL retrieval is supported though CDP (certificate distribute point) queries

E.
It support synchronous granting

F.
It supports online certification revocation