a$)$ Explain any TWO $(2)$ I$/$O problems which led to have I$/$O techniques.b$)$ Mention any THREE $(3)$ functions of I$/$O Module.c$)$ What is the advantage of Interrupt Driven I$/$O over Polling Method? What makes this difference?d$)$ What is the advantage of DMA over Interrupt driven I$/$O and Programmed I$/$O$.$ What makes this difference?