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What is downcasting?

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What is downcasting?

(a) Casting subtype to supertype

(b) Casting supertype to subtype

(c) Casting subtype to supertype and vice versa

(d) Casting anytype to any other type

I got this question in exam.

My query is from Downcasting in chapter Default Arguments vs Overloading, Upcasting and Downcasting of Object Oriented Programming

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Right option is (b) Casting supertype to subtype

Explanation: The downcasting concept includes only the casting of supertypes to the sub types. This casting is generally done explicitly. Larger size types are made to fit into small size types explicitly.

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