Which is an example of a valid input statement?

scanf$\_$s$("\%$i$",$ &input$)$;

Attach the peripheral device.

printf$("$The tax rate is: $\%\mathrm{.}2$lf$",$ taxRate$)$;

scanf$\_$s$("$Please enter the tax rate: $\%\mathrm{.}2$If

$",$ &taxRate$)$;