To tile multiple open worksheets on the screen, use the ________ command

One type of interface is a_______ interface, in which smart cards are inserted into a reading device and physical contact between the device and the card is necessary.

a) contact. b) physical. c) smart. d) None of the above.

The __________ layer is responsible for detecting errors and discarding any frames that contain errors.

Fill in the blank(s) with the appropriate word(s).