Question: What is the minimum number of labels required in a ProSe Application ID Name, and what should be the first label on the left?
Option 1: Two labels, with the first label being any string.
Option 2: At least one label, with the first label being "ProSeApp".
Option 3: Three labels, with the first label being "ProSeService".
Option 4: Four labels, with the first label being any string starting with "ProSe".
Explanation: According to the specifications, a ProSe Application ID Name should contain at least one label, and the first label on the left must be "ProSeApp". This ensures consistency and proper identification of ProSe applications.