Caesar Cipher Uses a Shift of Each Character by a Key

Multiple Choice

Caesar cipher uses a shift of each character by a key with a value between 1 and 255.An a with a shift equal to 3 becomes a d.For the decrypt method below, select the correct body.Assume the key shift property is accessible to the method.
public int decrypt(int b)
{
__________
}

A) return (b - key) ;
B) return (b + key) ;
C) return (b - key % 26) ;
D) return (b - key) % 256) ;