Which of the following devices accept data available on paper?
(i) 
(ii) 
(iii) 
(iv) 
ABoth (i) and (iii)
BBoth (ii) and (iii)
CBoth (i) and (iv)
DOnly (ii)
can you explain the basic concept
Ans 2:
Class : Class 6
Yes. The basic concept is that the OMR(Optical Mark Recognition) sheet accepts the data available on the paper that students write their answer. The printer it doesn't accepts the data available on the paper it prints itself. The scanner is just opposite of the printer. Well the last device it also scans itself but doesn't accept the data available on the paper.