Which statement about “Encapsulation” is correct?

a. Encapsulation refers to storing a value in a variable, and never changing it again. This way its value is safe forever.

b. Encapsulation refers to storing a value variable, and making it impossible to retrieve it.

c. Encapsulation refers to controlling the way a variable is accessed by forcing users to use getter/setter methods that prevent misuse of the variable.

d. Encapsulation implies that the methods of a class are not accessible to the other classes.