Imagine WAN Connections of an Enterprise Network Running on the AT&T's

Imagine WAN connections of an enterprise network running on the AT&T's PSDN as follows.

-What is a right entry of the IP address-Virtual Circuit mapping table on R1?
$$\begin{array} { | l c | c | c | } \hline & \begin{array} { c } \text { IP address of } \\\text { Destination Routers }\end{array} & \begin{array} { c } \text { Virtual circuit } \\\text { identifier }\end{array} & \begin{array} { c } \text { Exit interface } \\\text { (or sub-interface) }\end{array} \\\hline \text { A) } & 10.10 .10 .2 & \mathrm { VC } 1 & \mathrm {~S} 0 / 0 / 0.10 \\\text { B) } & 172.16 .10 .0 / 24 & \mathrm { VC } 3 & \mathrm {~S} 0 / 0 / 0.20 \\\text { C) } & 10.10 .10 .2 / 24 & \mathrm { VC } 1 & \mathrm {~S} 0 / 0 / 0 \\\text { D) } & 172.16 .10 .2 & \mathrm { VC } 3 & \mathrm {~S} 0 / 0 / 0 \\\text { E) } & 10.10 .10 .0 / 24 & \mathrm { VC } 1 & \mathrm {~S} 0 / 0 / 0.10 \\\hline\end{array}$$

A) A
B) B
C) C
D) D
E) E