Are the following input equipment, output equipment, CPU components, secondary storage devices, or data-communications related? (a) CRT

Question:

Are the following input equipment, output equipment, CPU components, secondary storage devices, or data-communications related?
(a) CRT screen,
(b) ALU,
(c) CD-ROM,
(d) Keyboard,
(e) Modem,
(f) Dot-matrix printer,
(g) Audio speaker,
(h) POS device,
(i) MICR reader,
(j) Laser printer,
(k) Magnetic tape,
(l) Flash memory,
(m) OCR reader,
(n) Magnetic (hard) disk,
(o) ATM,
(p) Primary memory,
(q) ALU.