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2 and 3 please help

2. What is the importance of the Valid to option in the Details tab on the certificate? a. It provides the time duration that the certificate will be acceptable. b. It provides the names of the hashing algorithm. c. It provides the public key d. It provides the name of the certificate. 3. If the user's file encryption key has been updated, you can use the cipher command option to update files that have been encrypted with the pre vious key