39. Which of the following is a common cause of meningitis in nonimmunized young children?

39. Which of the following is a common cause of meningitis in nonimmunized young children?

a)     Streptococcus pneumoniae

b)     Escherichia coli

c)      Staphylococcus

d)     Haemophilus influenzae

e)     None of the above