Answer & Explanation

4 Answers
Verified

Option A

It defines column names.
Additional Explanation
This option is incorrect for the stated requirement.
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Editorial Answer 1
Verified

Option B

It replaces foreign keys.
Additional Explanation
This option is incorrect for the stated requirement.
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Editorial Answer 2
Verified Correct Answer

Option C

Isolation controls how concurrent transactions can observe and affect each other's intermediate or committed changes.
Additional Explanation
Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.
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Editorial Answer 3
Verified

Option D

It compresses table data.
Additional Explanation
This option is incorrect for the stated requirement.
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Editorial Answer 4