In the school library, only by showing the certificate issued by the department can you enter the special collection library. If you do not participate in the research group of the professor, the department will not issue a certificate. Xiao Zhang was recently absorbed by Professor Li into his own because of his outstanding performance Xiao Wang quit Professor Chen's group last week for personal reasons. If the above assertion is true, which of the following must be true? ['Xiao Zhang can now access the special collection library.', 'Xiao Wang cannot access the special collection library now.', "As long as you enter the professor's research group, you can access the special collection library.", 'Did not obtain a certificate issued by the faculty, indicating that the group of professors did not participate.']