Given the following Python code

a$)$ Explain the purpose of the function myfilter

b$)$ Find the output of the code

c$)$ Use the myfilter function in a suitable way to select the nonnegative even numbers in the list numbers.

def myfilter$($list$1,$ list$2)$:

valid $=[]$

for $i$ in list$1$:

if $i$ in list$2$:

valid.append$($i$)$

return valid

def main$()$:

numbers $=[75,19,105,-24,-3,67,77,24,-45,38]$

valid$\_$numbers $=$ list$($range $(-99,100,3)$

print$($sum$($myfilter$($numbers$,$ valid$\_$numbers$)))$

main$()$