Consider the experiment in which a coin is tossed repeatedly until a head comes up. Then the sample space is:
A. S={H,TH,TTH,HTTH,TTTTH,⋯}
B. S={H,TH,THH,TTTH,THHTH,⋯}
C. S={H,TH,TTH,TTTH,TTTTH,⋯}
D. S={T,TH,TTH,TTTH,TTTTH,⋯}