Question: What is the condition for accepting a received sequence number SQN by the USIM, in terms of the difference between the current sequence number SEQ and the stored sequence number SEQMS?
Option 1: The difference should be less than or equal to 2^32 - 1.
Option 2: The difference should be greater than or equal to 2^16.
Option 3: The difference should be exactly equal to 0.
Option 4: The difference should be less than or equal to 2^8.
Explanation: According to the security architecture of 3GPP, the USIM will only accept a received sequence number SQN if the difference between the current sequence number SEQ and the stored sequence number SEQMS is less than or equal to 2^32 - 1. This ensures that arbitrary jumps in sequence numbers are not accepted by the USIM.