An email message containing a warning related to a non-existent computer security threat, asking a user to delete system files falsely identified as malware, and/or prompting them to share the message with others would be an example of:.
a) virus hoax
b) impersonation
c) phishing
d) bluejacking

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Suppose we have a byte addressable computer that has a 32-byte cache with 8 bytes per block. the memory address is 8 bits long. the system accesses memory addresses (in hex) in this exact order: 6e, b9, 17, e0, 4e, 4f, 50, 91, a8, ab, ad, 93, and 94. (a) assuming the cache is direct mapped, what memory addresses will be in cache block 2 after the last address has been accessed? (b) assuming the cache is direct mapped, what is the hit ratio for the entire memory reference sequence given, assuming the cache is initially empty? (c) assuming the cache is 2-way set associative with a lru replacement policy, what is the hit ratio?

The forerunner to cell phones, pdas, and smartphones was