Which Statement(s)is(are)true for Photomultiplier Tubes

Which statement(s) is(are) true for photomultiplier tubes?
I Photomultiplier tubes are very sensitive detectors,amplifying the photoelectron current by approximately 1 million.
II Emitted photoelectrons are accelerated toward positively charged electrodes called dynodes.
III Electrons strike the dynode with a kinetic energy less than the original emitted kinetic energy.
IV For each electron striking a dynode,more than one electron is knocked free.The additional electrons are accelerated toward the next dynode in the detector where amplification is repeated.

A) II
B) I and IV
C) II,III,and IV
D) I,II,and IV
E) II and III

Correct Answer:

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