What is the purpose of the usual access level modifiers trio "private, protected, public"?

Select one:

a. They modify the level of exposure of a class attributes (variable) or methods to the "world" outside the said class. In a class C1 For C1 attributes:

1. Private: encrypts the content of the attribute for all methods outside C1
2. Protected: encrypts the content of the attribute for all methods outside C1 and its subclasses.
3. Public: unencrypted value, almost like "no encapsulation".

For C1 methods:

1. Private: callable only by other methods in C1, not inherited in subclasses, code is totally encrypted
2. Protected: callable by other methods in C1, inherited in all its subclasses, callable by methods of C1 subclasses, code is encrypted outside the class hierarchy, readable within.
3. Public: callable everywhere, code readable everywhere.

b. They modify the level of exposure of a class attributes (variable) or methods to the "world" outside the said class. In a class C1 For C1 attributes:

1. Private: provide a "read protection" against any methods not member of C1.
2. Protected: provide a "read protection" against any methods not member of C1 or its subclasses.
3. Public: read accessible from everywhere, almost like "no encapsulation".

For C1 methods:

1. Private: callable only by other methods in C1, not inherited in subclasses, code is totally obfuscated
2. Protected: callable by other methods in C1, inherited in all its subclasses, callable by methods of C1 subclasses, code is obfuscated outside the class hierarchy, readable within.
3. Public: callable everywhere, code readable everywhere.

c. They modify the level of exposure of a class attributes (variable) or methods to the "world" outside the said class. In a class C1 For C1 attributes:

1. Private: accessible only to methods of C1.
2. Protected: accessible to methods of C1 and all methods of its subclasses.
3. Public: accessible everywhere, almost like "no encapsulation".

For C1 methods:

1. Private: callable only by other methods in C1, not inherited in subclasses.
2. Protected: callable by other methods in C1, inherited in all its subclasses, callable by methods of C1 subclasses.
3. Public: callable everywhere.

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