Question: What is the primary source of control for some Machine Type Communications (MTC) functions?
Option 1: Network configuration
Option 2: Subscriber data
Option 3: UE capabilities
Option 4: Indicators sent by the User Equipment (UE) to the network
Explanation: According to the provided text, some MTC functions are controlled by indicators sent by the UE to the network. This highlights the importance of UE-network communication in controlling certain aspects of MTC functionality.