Question: What is the purpose of including the Back-off timer value IE in the NAS protocol by the network?
Option 1: To request a maximum number of EPS bearers.
Option 2: To request a minimum time interval before procedure retry is allowed for specific ESM causes.
Option 3: To indicate the PDN type IPv4 only allowed.
Option 4: To signal the maximum number of PDN connections.
Explanation: The network includes the Back-off timer value IE to request a minimum time interval before procedure retry is allowed, but only for specific ESM causes that are not related to PDN type restrictions or bearer limitations.