In the Hub-Spoke Networking of MPLS BGP VPN Shown in the Figure

In the Hub-Spoke networking of MPLS BGP VPN shown in the figure below, users want to configure branches to communicate only with the headquarters but no other branches. To achieve this, which of the following solutions regarding RT settings can be used?

A) Headquarters: Import Target: 2:2; Export Target: 3:3 Branch 1: Import Target: 3:3; Export Target: 1:1 Branch 2: Import Target: 3:3; Export Target: 2:2
B) Headquarters: Import Target: 12:3; Export Target: 3:12 Branch 1: Import Target: 3:12; Export Target: 12:3 Branch 2: Import Target: 3:12; Export Target: 12:3
C) Headquarters: Import Target: 1:1; Export Target: 3:3
D) Headquarters: Import Target: 12:3; Export Target: 12:3 Branch 1: Import Target: 12:3; Export Target: 12:3 Branch 2: Import Target: 12:3; Export Target: 12:3