What best describes the difference between a seismograph and a seismogram

AA seismograph records tectonics activity,while a seismogram records volcano activity

B.a seismograph is the instrument that detects and records movement which in earth, while a seismogram is the recording

CA seismograph is the instrument that detects and records volcano activity,while seismogram is the written records of that activity

D.a seismograph is a written record of volcano eruption,while seismogram is a written record of an earthquake