Second, it's a good idea, but have you thought about it? Reading is not as popular as it used to be, and undergraduates don't need much now.
The third kind is very popular, but unstable and sometimes inactive.
Fourth, it is good for the time being, but it is not a long-term solution.
If there are only four roads, I personally think that the fourth one can be ruled out. If I were the second one, I wouldn't choose. The first one is similar to the third one, but I think translation is more difficult, but the gains may be greater.
Remember to adopt in time. . . .