Suppose there are 7 switches some of them are on and some of them are off. Now you are picking any two switches at a time and changing their state that is if the switch is on you are turning it off and if it is off you are turning it on. Now you have taken a sequence of moves and make all the switches on. Among the given options below choose the option which can't be the initial state of the switches.
A) on,off,on,on,on,on,on
B) off,on,off,off,off,off,off
C) off,on,off,on,on,off,off
D) on,off,on,off,on,on,on