Fill in the missing event that causes deadlock in a database. There are two processes (P1 and P2), each of which needs to update two records (R1 and R2) and the following sequence leads to a deadlock:1. P1 accesses R1 and locks it.2. P2 accesses R2 and locks it.3. ____4. P2 requests R1, which is locked by P1.
A. P2 releases R2.
B. P1 requests R1 again.
C. P1 requests R2, which is locked by P2.
D. P2 releases R1.
Answer: C
Computer Science & Information Technology
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