Refer to the exhibit, which shows the output of get router info bgp summary.

The get router info bgp summary output lists BGP neighbor status:

Prefix Reception: The "State/PfxRcd" column shows the number of prefixes received from the neighbor—neighbor 100.64.1.254 has "1", confirming option A.

Received Message Count: Under "MsgRcvd", 18 packets have been received from neighbor 100.64.1.254. This matches option C.

The second neighbor 100.64.2.254 is in "Active" state and has received/sent 0 packets, indicating that its TCP connection is NOT established, disproving option B.

There is no indication anywhere that the router is "still calculating" prefixes; "Active" just means no session is established, so option D is incorrect.