Senate regulations require classified material to be delivered to which office?

The Office of Senate Security (OSS) is the correct choice because it is specifically responsible for the oversight and management of classified materials within the Senate. This office ensures that sensitive information is handled appropriately and maintains the integrity of the security processes related to classified materials. The OSS manages the clearance processes for Senate staff and oversees the safe storage, access, and transmission of classified information in compliance with legislative and national security regulations.

The other options do not have the direct responsibility for classified materials within the Senate. The Department of Defense is more focused on military matters and classified information related to defense operations, while the Federal Bureau of Investigation typically deals with national security threats and criminal investigations rather than the internal legislative handling of classified information. The Senate Judiciary Committee, although involved in matters of legislative oversight and law, does not specifically oversee the handling of classified material as part of its primary functions.