In system suitability testing, what does a spike injection verify?

In system suitability testing, what does a spike injection verify?

• A. It verifies the purity of the mobile phase.
• B. It checks column temperature stability.
• C. It assesses carryover between injections.
• D. It verifies recovery by comparing post-spike peak area to the standard, confirming quantitative accuracy.

Answer: (D)