Q. Which one of the following is primary key in teachers relation?
Teachers

T_id	Course_id	Sec_id	Semester	Year
101	BIt-101	01	Spring	2010
102	CS-402	02	Fall	2009
103	CSE-101	02	Fall	2010
104	CS-201	04	Summer	2011

• T_Id
• Course_id
• Sec_id
• None of the mentioned

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