Question: In a DTLS 1.3 connection for Generic Authentication Architecture (GAA), what determines whether `Ks_ext_NAF` or `Ks_int_NAF` is used as the GBA shared key?
Option 1: The type of network application function (NAF) being accessed
Option 2: The location of the DTLS client, either in the Mobile Equipment (ME) or the Universal Integrated Circuit Card (UICC)
Option 3: The version of the Transport Layer Security (TLS) protocol used
Option 4: The specific DTLS message being exchanged
Explanation: The correct answer is Option 2 because, according to the procedures for DTLS 1.3 in the context of Generic Authentication Architecture (GAA), the choice between using `Ks_ext_NAF` or `Ks_int_NAF` as the GBA shared key depends on where the DTLS client resides - in the Mobile Equipment (ME) for `Ks_ext_NAF`, or in the Universal Integrated Circuit Card (UICC) for `Ks_int_NAF`. This distinction is crucial for deriving the DTLS premaster secret from the appropriate NAF-specific key.