Concept:Decoding data means changing data from a coded form back into a readable form.
This process is called decryption.
Explanation:When data is sent or stored, it may be encrypted to protect it from unauthorized access.
Encryption converts readable information into a secret code.
Decryption is the reverse process that changes the coded data back into its original readable form.
This allows the computer or the user to understand and use the information correctly.
So, the process of decoding data in a computer is known as decryption.
The other options do not fit: dilution is not related to computers, default drive is a storage location, and data security means protecting data from harm or loss.
Answer:C. Decryption