A manufacturing company makes a tables and y chairs and they find that the resulting sales (in dollars) are S(a, y) = 43 0.5 y0.5 If you use Excel to make a table of values for S(a, y), which of the following is the correct formula to use in cell B2? O a) 4*($B1)^0.5*(A$2) ^0.5 O b) 4*(B$1) ^0.5*($A2) ^0.5 O c) 4*(B$1)^0.5*(A$2) ^0.5 O d) 4*($B1) ^0.5*($A2) ^0.5