单选题 下述各图给出的4个并发调度中，不是冲突可串行的是______。
(1)

T1	T2
Read (A) Write (B)	Read (A) Write (A)

(2)

T1	T3
Read (A) Write (B)	Read (B) Write (A)

(3)

T4	T5
Read (A) Write (B)	Read (A) Write (B)

(4)

T1	T4
Read (A) Write (B)	Read (A) Write (B)