Mary has been locked out of her account after failing to correctly enter her password three times. As the system administrator, you need to unlock her account. Which of the following commands would unlock Mary's account assuming that you are using pam_faillock.so module?
a. faillock --reset --user mary
b. pam_faillock --unlock --user mary
c. pam_faillock --reset --user mary
d. faillock --unlock --user mary