Mark the statements that are true for frames.

When the evaluation of the body of a compound procedure is completed, the frame that holds the bindings for the compound procedure's formal parameters is no longer needed.

The lifetime of a frame that holds a variable's binding corresponds to the variable's extent.

A frame that is part of an environment in which a lambda expression is evaluated must potentially exist as long as the resulting compound procedure might be called.

A frame may exist separately from any environment as part of a closure.

All frames are part of an environment.