Which answer is a correctly punctuated compound sentence?
A.
Technology changes quickly and what is up-to-date today is old-fashioned next month.
B.
Technology changes quickly what is up-to-date today is old-fashioned next month.
C.
Technology changes quickly, what is up-to-date today is old-fashioned next month.
D.
Technology changes quickly; what is up-to-date today is old-fashioned next month.