What does the protocol field inside the PPP frame indicate?

A.
the protocol used to determine the authentication method

B.
the protocol used to identify the data in the Information field

C.
the protocol used to carry the PPP frame

D.
the protocol used to decode the FCS field

E.
the protocol used to detect the number of padding bytes

Explanation:
The Protocol field indicates the type of payload packet (e.g. LCP, NCP, IP, IPX, AppleTalk, etc.).
The Information field contains the PPP payload; it has a variable length with a negotiated
maximum called the Maximum Transmission Unit. By default, the maximum is 1500 octets. It
might be padded on transmission; if the information for a particular protocol can be padded, that
protocol must allow information to be distinguished from padding.