Given sine of theta equals (5/13) and cosine of theta equals (12/13), which of the following can be proven using a Pythagorean identity?

1 + (5/13)^(2) equals the (12/13)^(2)
1+(12/13)^(2)=(5/13)^(2)
(5/13)^(2)-(12/13)^(2) = 1
(5/13)^(2)+(12/13)^(2) = 1