Final answer:
None of the given options perfectly match the typically used security measure with the transfer protocol and its operation mode. However, option B with an SSL certificate, HTTP, and Active mode is the closest to what could be considered valid as it involves security for web connections.
Step-by-step explanation:
The question relates to selecting the correct combination of a security measure (like a key or certificate), a transfer protocol, and its operational mode. Here are the options explained:
- SSH key is used for establishing a secure shell session, typically not with FTP which uses its own security mechanism for passive or active connections.
- SSL key is not used on its own for loading in panels. Instead, SSL certificates are used in conjunction with HTTP protocol, typically in an active mode for establishing secure web connections.
- API key is generally used for application programming interface access and isn't related to FTPS or its modes directly.
- A SSL certificate, combined with the HTTP protocol, is indeed used to secure web connections. Active mode is a term more commonly associated with FTP, not HTTP.
Therefore, none of the combinations provided perfectly match the commonly used protocols and their modes. However, option B seems to suggest the use of a SSL certificate with HTTP in an active mode, which could be interpreted as an active server establishing secure connections, hence it is the closest to a valid option.