$12\mathrm{.}12.$ Ohm's law is$...[$Select allall options that apply by entering a string of letters. For example: If you believe X$,$ Y$,$ and Z are true, then enter $\text{'}$XYZ$\text{'}$ without the quotation marks.$]$

A$)$V$=$iR$=.$

B$)$ A basic law of nature that always applies to all conducting materials in all circumstances.

C$)$ Only approximately true for some materials in certain ranges of currents and temperatures.

D$)$ An approximate model that says electrical resistance certain types of conducting materials is constant.

Answer: