In Fred Griffith's experiments,harmless R strain pneumococcus became lethal S strain pneumococcus as the result of which of the following? 1)horizontal gene transfer 2)transduction 3)conjugation 4)transformation 5)genetic recombination
A)2 only B)4 only C)2 and 5 D)1, 3, and 5 E)1, 4, and 5