由于学号(SN)为00291的学生已毕业，欲在关系“Student”中删除该学生的所有信息，用元组关系演算语言实现应为 (53) 。
A．GET W (Student): Student. SN = 00291'<br> DELETE W
B．GET W: Student. SN = 00291'in Student<br> DELETE W
C．HOLD W (student): Student. SN = 00291'<br> DELETE W
D．HOLD W: Student. SN = 00291'in Student<br> DELETE W