what outgoing label will be imposed (used)?

Note: Please refer to the Case Study Domain.com Japan. For Certkiller 11 to reach IP address 192.168.1.33 ( Certkiller 12 loopback), what outgoing label will be imposed (used)?

A.
16

B.
17

C.
18

D.
19

E.
20

F.
Implicit Null