Security+ help.....

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help me to find out the right answer.....plz....

1.Disk storage for log files should be at least
a) 1 month of storage b) 1 yr of storage c) depends

2.in older unix, what is the file that shows encrypted passwords?
a) /etc/passwd, b) /etc/shadow c) ?? d)??

3.what happens when an email is sent in html format and the S/MIME .exe attachment is renamed?
a) keeps getting resent, b) is not readable, c) email server will delete,

4.Best method of security?
a)aes, b)des, c)3des, d)deffie helman