what is incorrect about the configuration shown?

Refer to the exhibit. A diagram of a router connected to an MPLS-enabled ATM switch via an LCATM MPLS interface, and a partial configuration for the MPLS-enabled ATM switch and router are
shown. Which statement describes what is incorrect about the configuration shown?
Exhibit:

A.
CEF has not been enabled on the router.

B.
The VPI range of 2-3 is invalid.

C.
The control VPI/VCI has not been set to 0/32 on the router.

D.
VC-merge has not been enabled on the ATM switch interface.

E.
The router has not been configured to specifically use LDP.

Explanation:
A: no ip cef commands present so this is true.
B: not correct. You can use vpi 2 and 3
C: no it hasn’t, it has been set to 5/31 so this is true
D: No it hasn’t, but it is enabled as default on an ATM switch. This might be true or false, it

depends on how you read it.
E: “mpls label protocol ldp” has not been specified so this statement is correct.
E must be the correct answer