$($a$)$ Determine if the waveform is dc$,$ odd, or even.

$($b$)$ Using the Fourier series below, determine the variables.

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Question $15$ options:

a$)$ Even

b$)$ a $=5,$ b $=20$

a$)$ DC

b$)$ a $=2\mathrm{.}5,$ b $=14$

a$)$ Even

b$)$ a $=1,$ b $=5$

a$)$ Odd

b$)$ a $=5,$ b $=20$