Question: When an object or structure variable is passed to a function as a constant reference the function accesses the original object, rather than a copy

When an object or structure variable is passed to a function as a constant reference
the function accesses the original object, rather than a copy of it.
the function cannot make any changes to the member variables.
it is more efficient than passing it by value.
all of the above are true.
A and B are true, but not C.
When an object or structure variable is passed to a function

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