x86-64 Assembly Language programming

2. What is the difference between following. - Do not ask me questions about reaffirming your ideas about answer a. BL and AL b. RAX and EAX c. Kernel Mode and User Mode. d. Heap and Stack e. BS and Data section. f. Stack and Text Section g. r8 and r8d h. RSP and ESP 1. CPU and RAM (Difference in terms of their function) j. RAM and Drive/SSD (Difference from addressing point of view)