Please pick up the wrong sentences on the following ones. <br/><br/>[1] They have come at 5 pm <br/>[2] They have come at 5 p.m <br/>[3] They have come at 5 PM <br/>[4] They have come at 5 P.M <br/><br/>Sometimes I couldn’t recall whether I should write as P.M or PM. <br/>Could you teach me for it? Thank you in advance for your teaching.