Which expression has a value of 1, when x = 2 and y = 4?

a: (2 squared + 8) / 4 - 2
b: (2 squared + 8) / (4 - 2)
c: 2 squared + 8 / (4 - 2)
d: 2 squared + 8 / 4 -2

make sure you use the order of operations:

1. simplify expressions inside parentheses.
2. evaluate exponents or radicals.
3. multiply and divide, in order, from left to right.
4. add and subtract, in order, from left to right.