A.bcp“northwind.dbo.employees"out”employees.txt"-C-q-U”，sa”-P”sa”
B.bcp“northwind.dbo.employees"to“emptoyees.txt"-c-q-U”sa”-P”sa”
C.bcp”northwind.dbo.employees"in“employees.txt"-c-q-U"sa”-P”sa”
D.bcp“northwind.dbo.employees"from“employees.txt”-c-q-U”sa”-P”sa”