Which of the following is a secondary memory device? A. Keyboard B. Disk C. ALU D. All of the above Right Answer: Disk Share : December 4, 2017 Asghar Khan Computer Total 0 Votes: 0 0 Tell us how can we improve this Mcqs? Captcha: + = Verify Human or Spambot ? Related Mcqs Check Below -A ____________is a microprocessor -based computing device?Which of the following memories must be refreshed many times per second?By programmable machine we mean?