A student has final examinations in 3 courses X, Y, Z, each of which is a 3 credit- hour course. He has 12 hours available for study period. He feels that it would be best to break the 12 hours up into 3 blocks of 4 hours each and to devote each 4-hour block to one particular course. His estimates of his grades based on various numbers of hours devoted to studying each course are as follows. Using dynamic programming, allocate his study time optimally. Data Ohrs D 4hrs D 8hrs 12hrs C B J Course X Course y D C B A Course z D B B