Which of the following is the BEST definition of the term “valid”? The act of favoring one thing over another.

The fundamental part of something.

Something that is reasonable and logical.

And incorrect view or opinion based on a misunderstanding.

If something is valid it is true, understandable, reasonable or logical so the answer your searching for is the 3rd one "Something that is reasonable and logical."

Explanation:

something that is reasonable and logical.

Explanation:

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !