Why is the Create Blocks function in calc scripts and Business Rules important in Planning?

A: Data may not exist for the combination of dense members so you have to create the block before calculating the data value for the block. B: Data may not exist for the combination of sparse members so you have to create the block before calculating the data value for the block. C: Data may not exist for the combination of dense members so you have to create the block before block loading data to the block. D: Data may not exist for the combination of sparse members so you have to create the block before loading data value to the block.