Which of the following statements is not correct?

a. In UML, access modifiers can be used to specify who can have access to a variable or method.

b. A private access modifier (denoted by the symbol “–”) is used in the case that the variable or method can only be accessed by the class itself.

c. A public access modifier (denoted by the symbol “+”) is used in the case that the variable or method can be accessed by any other class.

d. A protected access modifier (denoted by the symbol “#”) is used in the case that the variable or method can be accessed by both the class and its superclasses.