1- In a computer: a) A user acts as an intermediary between the operating system and the computer hardware b) The user, the operating system and the hardware are at the same level and communic through the system bus c) An operating system acts as an intermediary between the user and the computer hardware d) The hardware acts as an intermediary between the user and the operating system 2- The bootstrap program is usually stored: a) In ROM b) In RAM c) Can be stored in any memory storage d) No need to store it because it is part of the Kernel CPUs and device controllers compete for memory cycles: a) When they want to access the same location (data or instruction) b) Because main memory is a random access memory ) When they want to access the same data ) Because only one can access the memory at a certain time