What are the three flag bits in an IPv4 header?

What are the three flag bits in an IPv4 header? (Choose three.)

A.
TTL

B.
Unused

C.
Record Route

D.
DF

E.
MF

F.
Timestamp

Explanation:
http://www.erg.abdn.ac.uk/users/gorry/course/inet-pages/ip-packet.html