Which component is inserted into the AN/TPX-57 to store Mode 4 encryption codes?

The KIV-77 is the component that is specifically designed for use with the AN/TPX-57 radar system to store Mode 4 encryption codes. Mode 4 is an identification friend or foe (IFF) encryption standard used in military applications to ensure secure and reliable communications regarding friendly aircraft and targets. The KIV-77 provides the necessary cryptographic support, allowing for the storage and processing of these encryption codes, which is crucial for maintaining operational security and effective air defense management.

The other options mentioned, such as the KIV-78, KIV-79, and AN/TPX-56, do not serve the same function as the KIV-77 in the context of Mode 4 encryption storage for the AN/TPX-57 system. Each of these components might have different capabilities or applications in other systems but are not applicable here for the specific task of storing Mode 4 codes in the AN/TPX-57. Understanding the specific functionalities and interoperability of these components is vital for effective air defense operations and the proper management of encryption within military hardware.