Why are new enzymes required in gluconeogenesis to reverse the irreversible reactions of glycolysis?

The irreversible reactions are not involved in gluconeogenesis.

The irreversible reactions have very negative delta G values, requiring different enzymes to proceed in the reverse direction.

The irreversible reactions produce toxic intermediates that need to be bypassed.

The irreversible reactions are too slow, necessitating faster enzymes for gluconeogenesis.