Chang, Tian and An are three users of the system. Chang and An are in the same group. Tian is a Super User. Which of the following rights is inconsistent with the given policies

A． Tian has W(write) access to An's Mail files

B． Tian has E(execute)access to Art's Mail files

C． Chian has R(read) access to An's text files

D． Tian has E(execute) access to Chang's Binary files