Answer:
c. lead embedded in the glass of the monitor
Step-by-step explanation:
Lead is asubstance that stop electromagnetic wave at a certain diameter, so in computer systems, it is used in the monitor screen of a CRT or cathode-ray tube monitor to prevent such radiation from reaching the users.
Lead poisoning occurs when lead comes in contact with the blood, which can cause vomiting, respiratory and nervous system complications and death in worse cases.