What is the biggest security issue associated with the use of a Multiprotocol Label Switching $($MPLS$)$ network? $($D$6,$ L$6\mathrm{.}3)$

$1$ point

Lack of native encryption services

Lack of native authentication services

Use of Wired Equivalent Privacy $($WEP$)$ and Data Encryption Standard $($DES$)$ algorithms

The need to establish peering relationships to cross Tier $1$ carrier boundaries