Question: What action does the MME take if the bearer resource allocation requested by the UE is accepted by the network?
Option 1: The MME sends a BEARER RESOURCE ALLOCATION REJECT message to the UE.
Option 2: The MME initiates either a dedicated EPS bearer context activation procedure or an EPS bearer context modification procedure.
Option 3: The MME stops timer T3480 and enters the state PROCEDURE TRANSACTION INACTIVE.
Option 4: The MME releases the PTI value assigned to this procedure.
Explanation: According to the 3GPP specification, if the bearer resource allocation requested by the UE is accepted by the network, the MME shall initiate either a dedicated EPS bearer context activation procedure or an EPS bearer context modification procedure. This ensures that the necessary resources are allocated for the EPS bearer context.