The correct answer is: A. has/is
Lasers have many applications in communication. For example, they are used in fiber optic communication, which is a type of communication that uses light to transmit information. Fiber optic communication is very fast and reliable, and it is used in many different applications, such as telecommunications, data networking, and cable television.
Lasers are also used in other types of communication, such as laser printing and laser scanning. Laser printing is a type of printing that uses a laser to create an image on paper. Laser scanning is a type of scanning that uses a laser to create a digital image of an object.
In addition to communication, lasers are used in many other fields, such as medicine, manufacturing, and research.
Here is a brief explanation of each option:
- A. has/is This is the correct answer because lasers have many applications in communication.
- B. was/are This is not the correct answer because lasers are still used in communication today.
- C. does/are This is not the correct answer because lasers are not a verb.
- D. have/is This is not the correct answer because lasers are not a plural noun.
- E. is/is This is not the correct answer because lasers are not a singular noun.