Apart from the extent of the re-engineering, the principal factors that affect re-engineering costs are: The quality of the software to be re-engineered. The tool support available for re-engineering. The extent of data conversion required. The availability of expert staff. Select one: a. Only 1, 2 are Correct b. Only 2, 3, 4 are Correct c. All 1, 2, 3, 4 are Correct d. All 1, 2, 3, 4 are Incorrect