Question

deepfake technologies
a. can be applied to photos but not live video
b. can be detected even by casual viewers because of imperfections
c. help spread information about important issues
d. employ artificial intelligence techniques

Explanation:

Deepfake technologies use artificial intelligence (AI) algorithms. They can be applied to both photos and live - video (so A is wrong). They are often very sophisticated and not easily detected by casual viewers (so B is wrong). While they can be misused to spread misinformation, their core characteristic is the use of AI. They are not primarily used to spread information about important issues in a positive sense (C is incorrect as it's a misrepresentation of their main function).

Answer:

D. employ artificial intelligence techniques.