To resolve a server certificate check failure, which file should the custom certificate be saved as?

The correct choice for saving a custom certificate to resolve a server certificate check failure is the option that specifies saving it as a .pem file. The .pem format is widely used for encoding certificates and contains both the certificate and its private keys in a base64 format, making it suitable for a variety of applications, including web servers and client applications that need to establish secure connections.

By saving the custom certificate as a .pem file, your system can properly recognize and utilize the certificate for establishing secure SSL/TLS connections, ensuring that the certificate is trusted and that the server certificate check can be successfully completed without failing. This is crucial for maintaining secure communications in various applications and services where certificate validation is necessary.

Other filename options, while they might seem plausible, do not typically conform to the expected usage in trust store environments or application configurations that require custom certificates. In resolving issues specifically related to server certificate validation, maintaining the expected naming convention and file format—like .pem—is vital for proper function and compatibility.