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c++

what does the following mean?

class A: private B

Select one:

a.

class B will inherit all the private members from A without changining their access method.

b.

class B will inherit all the private members from A and make them private access.

c.

class A will inherit all the non-private members from B without changing their access method.

d.

class A will inherit all the non-private members from B and make them private access.