Question: What is the purpose of using the DEFAULT keyword when declaring a field with optional presence in ASN.1 syntax?
Option 1: To indicate that the field can be omitted and carries different semantics than any normal value.
Option 2: To identify a default value to be assumed if the sender does not include a value for that field in the encoding.
Option 3: To specify the need code for the optionally present field.
Option 4: To add OPTIONAL keywords for capability groups.
Explanation: The DEFAULT keyword is used to identify a default value to be assumed if the sender does not include a value for that field in the encoding. This allows the receiver to assume a specific value for the field even if it is not explicitly included in the message.