In MPLS (Multiprotocol Label Switching) encapsulation, for Layer 3 services, the customer's Layer 2 header is not preserved at the ingress Label Edge Router (iLER). Instead, the customer's data is encapsulated with the service provider's MPLS labels and Layer 2 headers. The correct answer is the statement that claims the customer's Layer 2 Header is preserved for Layer 3 services, which is false.