Question $1[20$ Marks$]$ a$)$ Strategic information systems planning $($SISP$)$ is essential for organisations to succeed. It is a continuous exercise that enables organisations to develop priorities for information system $($IS$)$ development. Describe any four $(4)$ assumptions of the SISP framework. $(12$ Marks$)$ b$)$ Briefly discuss any THREE $(3)$ main features of a Strategic Information Systems $($SIS$)$ of an organisation. $(8$ Marks