Which sentence uses periods correctly?
a. mrs. mj chong went to the meeting at 4:00 pm.
b. mrs. m.j. chong went to the meeting at 4:00 p.m.
c. mrs m.j. chong went to the meeting at 4:00 p.m..
d. mrs mj. chong went to the meeting at 4:00 p.m.?