BABA [Alibaba] SC 13G/A: JOINT FILING AGREEMENT Dated: February 14, 2017 (remainder
[JOINT FILING AGREEMENT Dated: February 14, 2017 (remainder of page intentionally left blank) JACK YUN MA Timothy A. Steinert Attorney-in-Fact JOSEPH C. TSAI Timothy A. Steinert] [POWER OF ATTORNEY (remainder of page intentionally left blank) JACK YUN MA JOSEPH C. TSAI CLARA WU MING-HUA] [POWER OF AT]