Final answer:
The data can be decrypted only by the server's private key.
Step-by-step explanation:
The correct answer is D). Server's private key.
When data is encrypted with the server's public key, it can only be decrypted using the corresponding private key. Encryption with a public key allows anyone to encrypt the data, but only the server with its private key can decrypt it.
For example, in the SSL/TLS protocol used for secure communication over the internet, the server's public key is used to encrypt sensitive information (such as passwords or credit card details) sent by the client. The server, which holds the private key, can then decrypt this data.