Question: During an MBS session update for a multicast MBS session, which of the following attributes can be modified in addition to "mbsServiceArea" and/or "mbsServInfo"?
Option 1: mbsFsaIdList attribute
Option 2: activityStatus attribute
Option 3: Both mbsFsaIdList and activityStatus attributes
Option 4: Neither mbsFsaIdList nor activityStatus attribute
Explanation: According to the procedure for MBS session update, for a multicast MBS session, in addition to modifying the "mbsServiceArea" and/or "mbsServInfo" attributes, the "activityStatus" attribute may also be modified. The mbsFsaIdList attribute modification is specifically mentioned as an option for broadcast MBS sessions, not multicast. Therefore, the correct answer focuses on the attribute permissible for modification in a multicast context.