Given that P = { x: 0 ≤ x ≤ 36, x is a factor of 36 divisible by 3} and Q = { x: 0 ≤ x ≤ 36, x is an even number and a perfect square}, find P n Q.

• A {1,4,9,36}
• B {3,9.36}
• C {9,36}
• D {36}