Annie has four cards of different colors. She writes letter $B$ on the red card and blue card, and writes letter $O$ on the yellow card and green card. Now Annie puts the four cards in a box. Bob is going to draw three of them from the box randomly. How many different possible results can Bob get? Among them, how many can Bob get his name? 
选项为:A:$6$; $3$  B:$4$; $3$  C:$6$; $2$  D:$4$; $2$  E:$6$; $1$  请回答其中一个选项.