A filename extension is used to Select one: O a. distinguishe file types O b. organize other files O c extend file capacity O d. divide files into clusters Fetching and Decoding data and instructions from memory is the responsibility of the Select one: O a. Data Bus O b. Registers O . Control Unit O d. Arithmetic and Logic Unit are types of volatile memory. Select one: O a. RAM and ROM O b. All of these O c. ROM and Cache O d. RAM and Cache