Answer:
Option (2) is correct.
The area of rhombus is 54 square feet.
Explanation:
Given : A rhombus with diagonals 9 ft. and 12 ft.
We have to find the area of a rhombus with diagonals 9 ft. and 12 ft.
Area of rhombus is given by the half the product of its diagonals.
Mathematically written as

Where
are the diagonals of rhombus.
given :
Subsititue, we have,

Simplify, we have,

Thus, the area of rhombus is 54 square feet.