Which BGP feature allows R1 to send R2 a list of prefixes that R2 is prevented from advertising to R1?

Refer to the exhibit.

Which BGP feature allows R1 to send R2 a list of prefixes that R2 is prevented from advertising to
R1?

A.
route refresh

B.
Prefix-Based Outbound Route Filtering

C.
distribute lists

D.
prefix lists