[单选] Which statement explicitly names a constraint? （）

A . ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students (student_id);
B . ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id);
C . ALTER TABLE student_grades ADD CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id);
D . ALTER TABLE student grades ADD NAMED CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id);
E . ALTER TABLE student grades ADD NAME student_id_fk FOREIGN KEY (student_id) REFERENCES students (student_id)

半导体中的载流子是电子和（）。电子。空穴。离子。 A customer is looking for a scalable KVM solution that supports at least 512 servers and is manageable locally and through the IP network. Which IBM KVM solution should a specialist propose to this customer？（） 1 x 8 console switch。 2 x 16 console switch。 2 x 8 Local Console Manager 2。 2 x 16 Global Console Manager 2。 You previously secured your listener with an encrypted password. However， you need to set a new password for security reasons. What is the correct method for setting a new encrypted password for the listener using the Listener Control utility？（） executing the SET PASSWORD command and then the SAVE_CONFIG command。 executing the CHANGE_PASSWORD command and then the SAVE_CONFIG command。 executing the CHANGE_PASSWORD command and then the SET PASSWORD command。 executing the SET PASSWORD command， then the CHANGE_PASSWORD command and finally， the SAVE_CONFIG command。 A client is experiencing bottlenecks in their IT environment.Which of the following responses address this issue?（） Meet with Operations Manager 。 Perform Scorpion study 。 Meet with CFO 。 Perform CDAT study。草坪的浇灌水方法： Which statement explicitly names a constraint? （）

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[单选] Which statement explicitly names a constraint? （）

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