The sequence is defined recursively. Write the first four terms. a1​=135;an+1​=1​/3(an​) A. a1​=135,a2​=45,a3​=15,a4​=5 B. a1​=135,a2​=105,a3​=75,a4​=45 C. a1​=135,a2​=405,a3​=1215,a4​=3645 D. a1​=135,a2​=67.5,a3​=33.75,a4​=16.875