Hi Teachers,<br/><br/>Is it correct to say:<br/><br/>a) Nice to hear of you.<br/><br/>b) Nice hearing of you.<br/><br/>c) Nice to hear from you.<br/><br/>d) Nice hearing from you.<br/><br/>e) None of them.<br/><br/>if it is the last one, could you tell me the correct one?<br/><br/>Thanks in advance.<br/><br/>TS