If to, tp and tm are the optimistic, pessimistic and most likely time estimates of an activity respectively, then the expected time ‘t’ of the activity will be:

• A. \(\frac{{{t_o} + {t_p} + {t_m}}}{3}\)
• B. \({{{t_o} + {t_p} + 3{t_m}}}{5}\)
• C. \(\frac{{{t_o} + {t_p} + 2{t_m}}}{4}\)
• D. \(\frac{{{t_o} + {t_p} + 4{t_m}}}{6}\)