Which among the following can you consider as $$input devices$?$

a$.$

Keyboard$/$mouse$/$printer$/$pen$/$microphone$/$touchscreen

b$.$

Keyboard$/$mouse$/$camera$/$pen$/$microphone$/$touchscreen

c$.$

Mouse$/$camera$/$pen$/$microphone$/3$D printer$/$ keyboard$/$

d$.$

Camera$/$pen$/$microphone$/$monitor$/$touchscreen