3. This question is about computer architecture. (a) In most common architectures, a memory access to an odd-valued address may either fail, or be slower than a memory access to an address which is a multiple of 4 or 8. Briefly explain why. [10 marks] (b) Describe the two main issues which apply to the use and availability of the following for kinds of memory. Describe how these issues apply to each sort of memory (a very brief description for each). [10 marks] i. Registers; ii. Flash memory; iii. Dynamic RAM (main memory); iv. Static RAM (cache)