Adesign principle in which the internals of a module are deliberately not exposed (or not usable by code that doesn't need to know the details) is called:
a) method hiding
b) data hiding
c) information hiding
d) all of these

D) All of these

Explanation:

Method hiding, data hiding and information hiding are based on the principle by which the internals of the modules are not exposed.

Information hiding: This process basically hide all the details of the data and function. The hiding all these type of detail may result in abstraction and it basically reduces the complexity to make a function more easy to use.  

Data hiding and method hiding also involve the process of hiding the data and design on the principle in which the internal module are hidden.

there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?