Answer: (B) Symmetric 
Step-by-step explanation:
 The symmetric encryption one of the type of method in which only one key is used for both the type of electronic information that is decrypt and encrypt. 
-  In the computer technology, the symmetric encryption is used as the singular type of encryption key for displaying the electronic message. 
 -  It uses various types of mathematical algorithm for the purpose of data conversion which results into the inability to find out the message. 
 - Is is used as the secret key for encipher and also decipher the message. 
 
Therefore, Option (B) is correct.