Which ONE of the following will list the call_id's for all calls that both originate and terminate in a foreign switch. That is, whose originator and terminator are both trunks (as opposed to lines or treatments)? Select one: O a. T[call_id] (calls * trunks * trunks) O b. T[call_id] (TT[call_id,term] (calls ~[orig=portid] trunks) [term=portid] trunks) O c. T[call_id] (calls [orig=term] trunks) O d. Ti[call_id] (calls [orig=portid AND term=portid] trunks) O e. o[call_id] (calls [orig=term] trunks)