Consider the following worksheet, where some of the rows have been hidden. The tax table indicates the tax rates on adjusted gross income for a fictional country. In this country, the tax rate depends not only on the family's adjusted gross income, but also on the number of children in the family. For example, if a family's adjusted gross income is at least $$50,000$ but less than $$100,000,$ and the family has one child, they pay a federal tax of $17\%$ of their entire adjusted gross income. To calculate the federal tax for each family, you could do which of the following?

a$.$ Enter the formula $=$C$4*$IF$($B$4=0,$VLOOKUP$($C$4,$$F$$4$:$I$$8,2),$IF$($B$4=1$ or $2,$VLOOKUP$($C$4,$$F$$4$:$I$$8,3),$VLOOKUP$($C$4,$$F$$4$:$I$$8,4)))$ in cell D$4$ and copy it down.

b$.$ Enter the formula $=$C$4*$VLOOKUP$($C$4,$$F$$4$:$I$$8,$IF$($B$4=0,2,$IF$($B$4<=2,3,4)))$ in cell D$4$ and copy it down.

c$.$ Enter the formula $=$C$4*$IF$($B$4=0,$VLOOKUP$($C$4,$$F$$4$:$I$$8,1),$IF$($B$4<=2,$VLOOKUP$($C$4,$$F$$4$:$I$$8,2),$VLOOKUP$($C$4,$$F$$4$:$I$$8,3)))$ in cell D$4$ and copy it down.

d$.$ None of these choices are correct.