Which three statements are true about passing parameters to subprograms?

PL/SQL assigns values to actual parameters in subprograms with unhandled exceptions.

IN parameters passed to subprograms act like constants, to which values cannot be assigned by the subprogram.

IN OUT parameters pass initial values to subprograms and return values updated by subprograms to the caller.

The actual parameter must be a variable when calling a subprogram with an OUT parameter.

IN parameters passed to subprograms act like variables, to which values can be assigned by the subprogram.

OUT parameters returning values to calling subprograms act like constants in the called subprogram.

Actual parameters corresponding to IN OUT formal parameters can be constants or expressions.