单选题Which of the following statements allows BOB to revoke access to the SAMPLE database from user TOM?（）AREVOKE ACCESS ON DATABASE FROM USER bobBREVOKE CONNECT ON DATABASE FROM USER tomCREVOKE tom FROM ACCESS ON DATABASE BY USER bobDREVOKE tom FROM CONNECT ON DATABASE BY USER bob
单选题
Which of the following statements allows BOB to revoke access to the SAMPLE database from user TOM?（）
A
REVOKE ACCESS ON DATABASE FROM USER bob
B
REVOKE CONNECT ON DATABASE FROM USER tom
C
REVOKE tom FROM ACCESS ON DATABASE BY USER bob
D
REVOKE tom FROM CONNECT ON DATABASE BY USER bob
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