How can the statement be rewritten as a conditional statement in if-then form?

A rectangle with 4 congruent sides is a square.

If a rectangle has 4 congruent sides, then it is a square.
If a figure has 4 congruent sides, then it is a square.
If a figure has 4 congruent sides, then it is a rectangle or square.
If a figure is a rectangle, then it is a square.