Task: Question Answering
Input (English): Question: Mass spectrometry is combined with chromatography to generate a very powerful analytical tool. With regard to mass spectrometry (MS), it can be said that: 
 Options:  <1> The electronic ionization is based on the ion-molecule reactions between the reactive gas ions and the analyte molecules. <2> The linear quadrupole mass analyzer consists of four cylinders that are placed in parallel so that they are positively and negatively charged alternately. <3> The flight time analyzer is based on a tube of highly charged material so that only the opposite charge ions enter and separate. <4> The ion trap can be placed at the end of the chromatographic column for molecular ions from the already separated analytes and impact on the screen of a radioactive detector. <5> The ionization method known as MALDI is based on the desorption of ions from a matrix in the form of a gel by rapid bombardment of supercritical gas.
Output (English): 2