One of the plots shown below represents the time history of a vibration signal sampled at $100$ Hz and is defined by the function:

F$()=1$in$(21)+2(22)+3(23)$

Screenshot $2021-12-03174609.$png

Where A$1=0\mathrm{.}4$g$,$ A$2=1\mathrm{.}0$ g$,$ and A$3=0\mathrm{.}7$ g; f$1=10$Hz$,$ f$2=20$Hz$,$ and f$3=25$ Hz$.$