The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

Many top universities now offer online classes. They teach everything from computer programming to the science of cooking. Many classes are at little or no cost. They are restructured more often than traditional college programs. that's important to the millions of students who learn technical and other skills from Lynda.com.

The （） of online classes on college programs.