Which of the following is a correct statement about safe password management?
a) It is never necessary to change a password unless it is clear that it has been compromised.
b) The nature of the resource a particular password protects will affect, to some degree, how strong it needs to be.
c) It is acceptable to have the same password for all systems and resources one uses.
d) Passwords may be shared with close colleagues or friends, in order to have another source in case a password is forgotten.
