Which imaging technique shows brain activity in a living person? functional magnetic resonance imaging (fmri) pet scan near infrared spectroscopy all of the above?

The answer is functional magnetic resonance imaging (fMRI), it is a magnetic resonance imaging in which changes in elements such as iron or oxygen are measured during the performance of a specific behavior; used to measure cerebral blood flow during behavior or resting while resting-state fMRI (rs-fMRI) magnetic resonance imaging method that measures changes in elements such as iron.