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Raymundo is writing an explicit function for the arithmetic sequence:$\newline$$$20,15,10,5, \ldots$$$\newline$He comes up with$\newline$$$s(n)=20-5 n \text {. }$$$\newline$What domain should Raymundo use for $s$ so it generates the sequence?$\newline$Choose $1$ answer:$\newline$(A) $n \geq 0$ where $n$ is an integer$\newline$(B) $n \geq 0$ where $n$ is any number$\newline$(C) $n \geq 1$ where $n$ is an integer$\newline$(D) $n \geq 1$ where $n$ is any number