Which answers correctly complete the blanks? Select all that apply. A language is while a dialect is

A.
a system of communication used by a group / a particular regional variation.

B.
a code of symbols and sounds / a subdivision of a language.

C.
understood only by native speakers / understood by larger groups.

D.
static / continually evolving and changing.

E.
strengthened by migration / suppressed by interactions and globalization.