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When are the object type known for upcasting the objects?

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When are the object type known for upcasting the objects?

(a) Compile time

(b) Runtime

(c) Source code build time

(d) Doesn’t apply to objects directly

I got this question in exam.

This intriguing question originated from Upcasting topic in division Default Arguments vs Overloading, Upcasting and Downcasting of Object Oriented Programming

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Right option is (b) Runtime

Best explanation: The upcasting with objects directly requires runtime resolving. The objects are fixed and address are allocated at compile time. But the execution of a program requires runtime knowledge of object types, for implicit type cast.

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