Which one is not a requirement of a binomial distribution?

Question

$\begin{array}{1 1}(A)\;There\; are \;2\; outcomes\; for\; each \;trial\\(B)\;There \;is\;a\;fixed\;number\;of\;trials\\(C)\;The\; outcomes\;must\;be\;dependent\;on\;each\;other\\(D)\;The \;probability\;of\;success\;must\;be\;the\;same\;for\;all\;the\;trials\end{array}$