Which of the following languages accurately describes the regular expression (a+b+c)"(a+c) O Set of strings over {a,b,c) that always ends with 'a' O Set of strings over (a,b,c) that always ends with 'a' or 'c O Set of strings over {a,b,c) that always ends with 'ac! Set of strings over {a,b,c} that always begins with 'a' or 'c' or 'b