$4.$ Which of the following statements describes how a dynamic array formula is displayed in execel?

a$.$ The spill area is defined and then the results of the formula are calculated

b$.$ The formula is defined in the source cell and the out pout spills from the source cell

c$.$ The formula is defined in the source cell and then dragged down to fill in the other cells in the array

d$.$ The input array is defined in the spill area and then copied to the source cell