When Studying Haemophilus Influenzae, Which of Its Properties Would Be

When studying Haemophilus influenzae, which of its properties would be most useful to know in determining whether a strain is infectious or not?

A) Its genome size, because strains with much larger genomes are more likely to be infectious
B) Its genome size, because strains with much smaller genomes are more likely to be infectious
C) Surface proteins, because strains with surface proteins are more likely to be infectious
D) Surface proteins, because strains without surface proteins are more likely to be infectious
E) Plasmids, because strains with plasmids are more likely to be infectious