What would the output be when the following nested if statements were executed?

x = 55
y = 13
if x % 2 == 0:
if y % 2 == 0:
print('x-x')
else:
print('x-y')
else:
if y % 2 == 0:
print('y-x')
else:
print('y-y')

a. x-y
b. y-y
c. x-x
d. y-x