Which three ESP fields can be encrypted during transmission?

Which three ESP fields can be encrypted during transmission? (Choose three.)

A.
Security Parameter Index

B.
Sequence Number

C.
MAC Address

D.
Padding

E.
Pad Length

F.
Next Header

Explanation:
BD
The packet begins with two 4-byte fields (Security Parameters Index (SPI) and Sequence Number). Following
these fields is the Payload Data, which has substructure that depends on the choice of encryption algorithm and
mode, and on the use of TFC padding, which is examined in more detail later. Following the Payload Data are
Padding and Pad Length fields, and the Next Header field. The optional Integrity Check Value (ICV) field
completes the packet.
Source: https://tools.ietf.org/html/rfc4303#page-14