14. "it-r111,r are tccls such as Excel and Access generally net effective tccls for 31331?sz \"big data\"? A. Because much of the date are unstructured and {liicult tc fcrmat. B. Most people do not know how tc use Access features such as queries. C. Excel is better for reperting semiqstructured date, but not unstructured data. D. Excel and Access are the most useful tccls fer analyzh'lg \"big date.\