What is called as the electromagnetic spectrum?

If ${\lambda _v}$,${\lambda _x}$,and ${\lambda _m}$ represent the wavelengths of visible light,$X$-rays,and microwaves respectively,then:

Frequencies of various radiations are given as:
$v_v \rightarrow$ Visible light
$v_r \rightarrow$ Radio Wave
$v_{uv} \rightarrow$ Ultraviolet Waves
Then which of the following is true?

$(i)$ The wavelength of microwaves is greater than that of $UV$-rays.
$(ii)$ The wavelength of $IR$ rays is less than that of $UV$-rays.
$(iii)$ The wavelength of microwaves is lesser than that of $IR$ rays.
$(iv)$ Gamma rays have the shortest wavelength in the electromagnetic spectrum.
Of the above statements:

Which of the following has the minimum frequency?

What is the range of the radio frequency band for $FM$ (Frequency Modulated) broadcasting?