The length of the hypotenuse of a right triangle is 145 units. the length of one leg of the triangle is 144 units. mike wrote the following step to find the length of the unknown leg: length of the unknown leg = 1452 − 1442 = 21,025 − 20,736 = 289 units which statement best explains whether mike's step is correct or incorrect?

i will give 30 points and a brainliest

a- it is incorrect because the length of the unknown sides is the square root of 289.
b- it is incorrect because the length of the unknown side is the square root of 41,761
c-it is correct because the length of the unknown side is the difference of the lengths of the sides
d- it is correct because the length of the unknown side is the difference of the squares of the side