Which of the following(s) is(are) the disadvantage of mass spectrometry?
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      I.    It can not be hyphenated with HPLC or GC
     II.    Not useful in structural characterization
   III.    High maintenance of instruments
   IV.    Not useful in quantification
    V.   Trained personnel for the operation
a. II, IV, V
b. III and V
c.IV and V
d. III, IV, V
e. I, II and III
f. II, III and V
g. II and III
b
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