Question $1(10$ points$)$

in Natural Deduction, a proof is

a series of steps that show the premises lead, by way of valid rules of inference, to the conclusion

a series of steps that show the conclusion leads, by way of valid rules of inference, to the premises

a series of steps that show the premises and the conclusion support each other

a series of steps that show the premises lead, by way of more assumptions, to the conclusion.