All of the Following Are True for Hollow-Cathode Tubes,except

All of the following are true for hollow-cathode tubes,except:

A) hollow-cathode tubes emit narrow emission lines,too narrow for slits to isolate.
B) the cathode of a hollow-cathode tube is made of the same element whose emission lines we want.
C) the low pressure Ne or Ar gas is ionized when voltage is applied,which ionizes the gas and accelerates the ions toward the cathode.
D) the kinetic energy of the ionized gas is sufficiently high to sputter metal atoms from the cathode.
E) the gaseous metal atoms are excited by collisions with high-energy electrons and emit photons with characteristic wavelengths that are absorbed by the analyte.