PAM Modules are Shared Objects .so so that part is true. and they re located in /lib.
check it yourself: find /lib/ -name "pam_permit.so" on Ubuntu it gives "/lib/x86_64-linux-gnu/security/pam_permit.so"
https://linux.die.net/man/5/pam.d
module-path is either the full filename of the PAM to be used by the application (it begins with a '/'), or a relative pathname from the default module location: /lib/security/ or /lib64/security/, depending on the architecture.
The pam modules are stored as shared object files (.so) in /lib/security/. A directory sbin has nothing to do in /usr/lib. So E is definitely wrong. D is correct.
as per my prep materials (and irl checks) the correct answer is
/usr/lib/security or /usr/lib64/security (also IRL checked on Centos5.5/7.8/Debian10.3) - I'm really confused, right here. The Question is malformed? /etc/security has some relevance, for the config...
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