Is the encapsulation of method details within a class.
a.
implementation hiding
b.
a calling method
c.
instantiation
d.
an interface

Implementation hiding is the encapsulation of method details within a class. Implementation can be interpreted as those specifications which can be altered without altering the correctness of an application. Wrapping data/methods within classes (descriptions of the way all objects of this type will look/act) in combination with implementation hiding is called encapsulation. Information users need to know about behaviors should be available without dependence on implementation specifications.

(because i need 20 chars)