Which of the following best defines a beta hydrogen in the context of elimination reactions?

During an elimination reaction, what is the significant change occurring in the molecular structure?

What happens to the beta hydrogen during the conversion of two sigma bonds into a pi bond in an elimination reaction?

If a molecule has four non-equivalent beta carbons, how many potential elimination products might be formed?

Given a molecule with a complex structure, what steps would you take to predict the potential elimination products?