Which sentences are OK? Person A - When will you get home? Person B - Why are you asking? Person A - I'm locked out. Person B - I'll be there in about 30 minutes. If Person A replies following sentences; OK, l'll be waiting for you out front. OK, l'll be waiting for you at the door. OK, l'll be waiting for you in the doorway. OK, l'll be waiting for you at the doorway.