What is the reverse integral property of definite integrals?

• A. ( int_a^b )f(x)dx=- ( int_b^a )g(x)dx
• B. ( int_a^b )f(x)dx=- ( int_b^a )g(x)dx
• C. ( int_a^b )f(x)dx= ( int_b^a )g(x)dx
• D. ( int_a^b )f(x)dx=- ( int_b^a )f(x)dx