Question: In 3GPP NR RRC protocol, what is the primary purpose of introducing extension markers within a SEQUENCE, especially in size-critical messages?
Option 1: To reduce the overall message size by eliminating unnecessary fields.
Option 2: To ensure backward compatibility with previous 3GPP releases.
Option 3: To facilitate future extensions while maintaining important information structures and allowing for complex structure additions without disrupting existing formats.
Option 4: To mandate the inclusion of all optional fields in every message transmission.
Explanation: Extension markers within SEQUENCE are primarily introduced to enable future extensions, maintain crucial information structures (e.g., parameters specific to one Radio Access Technology), and allow for complex structure additions without disrupting existing formats, balancing future-proofing with message size constraints in size-critical messages.