2) Given: A MIPS computer system with 1 GB of main memory. It has a 4K-Byte direct-mapped cache with a block size of 4 words. a) How many bits wide is the address bus? b) How many lines are in the cache? c) How many bits wide is the tag field? d) Show the bit field encoding for memory addresses. 3) Given the system described in question 2) above. Draw a diagram showing address and data buses, bus widths, and bus directions. Show internal cache organization and internal main memory organization.