The development of calculus, a branch of mathematics that deals with rates of change and accumulation, is primarily attributed to which two mathematicians?

$($a$)$ Isaac Newton & Gottfried Wilhelm Leibniz $($b$)$ Hypatia & Euclid $($c$)$ Pythagoras & Thales $($d$)$ Ren$$ Descartes & Pierre de Fermat$>?>$