What occurs in the encapsulation process as a data packet moves from a LAN across a WAN?

What occurs in the encapsulation process as a data packet moves from a LAN across a WAN?

• The Layer 2 encapsulation changes to a format that is appropriate for the WAN technology.
• The Layer 3 encapsulation changes to a format that is appropriate for the WAN technology.
• Both Layer 2 and Layer 3 encapsulation change to a technology that is appropriate for the WAN.
• Both Layer 2 and Layer 3 encapsulation remain constant as the data packet travels throughout the network.

Exam with this question: CCNA Discovery 3: DRSEnt Chapter 7 Exam