A. the L4TM allow list overrides the block list
B. the overlap of the L4TM allow list and block list is the L4TM grey list
C. the L4TM block lists override the allow lists
D. L4TM allow list and block list overlaps are not permitted

A. <>（the null string）
B. Wget/1.8.1
C. Mozilla/5.0
D. Opera/9.0