An analytical instrument is designed to monitor both the stretching vibrations of functional groups and electronic excitations in organic pigments during a single experiment. Which combination of radiation sources would best meet this requirement?
a) Ultraviolet for vibrations and infrared for electronic excitations
b) Infrared for vibrations and ultraviolet/visible for electronic excitations
c) Microwave for vibrations and near-infrared for electronic excitations
d) Far-infrared for vibrations and visible light for electronic excitations