Which is the most liker mode of decay for each of the following? In the case that more than one mode of decay is possible, please mark all possible modes of decay. (a) "'51:. _| A. alpha decay _] B. beta decay _] C. electron capture | D. positron decay (b) '4' Eu 1 A. alpha decay _1 B. beta decay _J C. electron capture 1 D. positron decay (c) 2'" Am J A. alpha decay _J B. beta decay J C. electron capture _J D. positron decay