[单选题]2.Planagainstdistractions.Setboundariesifyou’reworkingathomebyexplainingtofamilymembersorchildrenthatyourworkareaisofflimits,andtheyshouldavoidinterruptingunlessit’simportant.Question:whichofthefollowingisasynonymof"offlimits"in"yourworkareaisofflimits"?