The plaque morphology of wild type and rll mutants of T4 bacteriophage following infection of different E. coli strains is summarized below.

	E. coli strain
T4 phage strain	B	K
wild type	Small and ragged	Small and ragged
rll mutants	Large and round	No plaques

The following two experiments were carried out:

Experiment I: Co-infection of two independent rll mutants on E. coli K strain resulted in several plaques, all being small and ragged.

Experiment II: E. coli B strain was co-infected with the above rII mutants. T4 phages from the resulting plaques were used to infect E. coli K strain. Few plaques were obtained, which were all small and ragged.

Based on the observations, the following statements were made:

A. Experiment I indicates that the two mutants are allelic.

B. Experiment II indicates that the wild type T4 phages that infected E. coli K strain resulted from a recombination event.

C. In experiment II, if the T4 phage isolated from the E. coli B strain was used to infect E. coli B strain, all plaques would be large and round.

Which one of the following options is a combination of all correct statements?