DS, CE, and Math-CS are all good majors if that is what you really want to study, but they are all somewhat different from CS. If you are truly undecided between these majors, look at the curriculum for each one at some of the universities you’re interested in, and think about what you prefer.
If your preferred major is CS, it’s best to apply directly to CS. Don’t try to game the system by applying to a major that seems like an easier admit, because at many universities it is very difficult or impossible to switch into the CS major if you aren’t directly admitted.