When BGP is used for routing within an autonomous system which of the below annotation is this normally referred to

Answer options:

A.pBGP
B.iBGP
C.eBGP
D.sBGP

Answer - B
BGP may be used for routing within an autonomous system. In this application it is referred to as Interior Border Gateway Protocol, Internal BGP, or iBGP. In contrast, the Internet application of the protocol may be referred to as Exterior Border Gateway Protocol, External BGP, or eBGP
For more information on the Border gateway protocol please see the below link:
https://en.wikipedia.org/wiki/Border_Gateway_Protocol