Choosing the right subjects at this stage is very important. All of these subjects are quite good in its own position.

However I will suggest you to go with C++ as there us huge demand of computer networks today.

But If you are not interested in the computer science subject then you can go for any of the course in which you are interested

Most Important thing to keep in mind while choosing the subjects is to choose that subject in which your interest lies. Final decision is totally yours