Task: Question Answering
Input (English): Question: The ionization source known as Inductive Coupling Plasma used in Elemental Mass Spectrometry, is characterized by: 
 Options:  <1> Generate mostly monatomic ions. <2> Fragment the organic molecules in molecular ions that allow their identification. <3> Be a low energy source. <4> Run at high vacuum. <5> Reach detection limits of the order of mg L-1 for most elements.
Output (English): 1