Which neuroscience investigation technique uses detectors that are sensitive to hemoglobin levels in the blood?

Question

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fMRI (functional magnetic resonance imaging) uses detectors that are sensitive to hemoglobin levels in the blood to map brain activity by measuring changes in blood oxygenation. This technique allows researchers to observe which areas of the brain are active during specific tasks or experiences. PET scans (A) use a different approach, involving the injection of a radioactive tracer into the bloodstream. TMS (B) and MEG (D) are non-invasive techniques that measure brain activity through magnetic fields, but they do not directly measure changes in blood flow.

Which Neuroscience Investigation Technique Uses Detectors That Are Sensitive to Hemoglobin