The correct answer is the presence or absence of a mark such as a pencil mark. Optical Mark Reading (OMR) is a method of entering data into a computer system. Optical Mark Readers reads pencil or pen marks made in pre-defined positions on paper forms as responses to questions or tick list prompts. The OMR technology could be used if data is to be collected from many sources simultaneously, a large volume of data must be collected and processed in a short period of time, information mainly comprises the selection of categories or "tick box" answers to multiple-choice questions. The OMR data entry system contains the information to convert the presence or absence of marks into a computer data file. Hence, the correct answer is the presence or absence of a mark such as a pencil mark.