AGE "Accepts value $18$ to $56$

a$)$ What is the Valid Input? $20$

b$)$ What is the Invalid Input? $60$

c$)$ What is the Valid Class?

d$)$ What is the Invalid Class $($you can mention more than one if any$)?$

e$)$ How many valid and invalid conditions$($classes$)$ are there? $(3$ marks$)$