Question: Which two statements are correct? A const variable is a compile - time constant if its initializer is a constant expression. Proper use of const

Which two statements are correct?
A const variable is a compile-time constant if its initializer is a constant expression.
Proper use of const is important when passing by value.
Proper use of const is important for pass by reference, and pass by address.
I chose 2,3, and 4 last time, one of those is incorrect

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