A coin is flipped three times. H represents heads, and T represents tails. What is the sample space?

{HHH, TTT, HTT, HHT, TTH, THH, THT, HTH}

(HHH, TTT, HTT, THH, THT}

{HH, TT, HT, TH}

{HTT, HHT, TTH, THH, HTH}​