$\begin {array} {1 1} (A)\;2\: is\: a\: positive\: number\: or \: a \: negative\: number \\ (B)\;All \: natural \: numbers\: are\: either \: even\: or\: odd \\ (C)\;A\: person\: who\: has \: taken \: mathematics\: or\: electronics\: can\: go\: for\: masters \: degree \\ (D)\;3\: is \: a \: prime\: number\: or \: it\: is\: odd \end {array}$