As soon as prebiotic foods reach the large intestine they turn into short chain fatty acids. These short chain fatty acids feed the microbiome (created by the probiotic foods). It is best to get these from your food as you cannot out supplement a good diet.  

Your gut LOVES DIVERSITY and there are many varieties to each of the prebiotic foods listed. If you aim for at least 30 different varieties per week, you will feed the good bacteria (microbiota) in your gut.