The series of address references given as word addresses are: 7 5 2068 1 3 49 Show hits and misses for the reference addresses given above for the caches with the following characteristics and show the final cache contents. a) (10 points) A direct-mapped cache with four-word blocks and a total size of 8 words. b) (10 points) A fully associative cache system with two-word blocks and a total size of 8 words with LRU replacement.