Given the below code snippet of a function definition, answer the following questions,

def Function$\_$demo $($num$1=1,$ num$2=2)$:

num$1=$num$1*$ num$2$

num$2+=$ num$2$

print$($num$1,$ num$2)$

a$)$ Demonstrate the following with appropriate reasoning:

i$.$ Call the given function without any parameters.

ii$.$ Call the given function by passing values $2$ and $1$ as parameters.

b$)$ Modify the above given Python function such that the calculations

are performed on the parameters only if the values of num$1$ are greater

than $0$ and num$2$ are less than $10.$ Provide proper error messages for each

invalid input.