Here is a hypothetical entry from the $/$etc$/$shadow file. Answer the following questions based on this entry:

naina:$$1$$nfqpGleOffcp$0$i:$13000$:$0$:$30$:$7$:$1$::

a$.$ Which algorithm was used to hash the password?

b$.$ What is the maximum number of days the password is valid?

c$.$ What is the date that this account will expire?