The relational algebra expression that can correctly retrieve " the name of the male student in the computer science department" is (　　).

A、πName（σDepartment='Computer'Λsex='Male'(Student)）
B、πName（σDepartment='Computer'(Student)）∩πName（σsex≠'female'(student)）
C、πName((σDepartment='Computer'(student)）Λ（σsex='male'(student)））
D、πName(σDepartment='Computer'(Student)xπName（σsex='male'(student)）