In the code that collects responses to a poll, what is the purpose of the polling$\_$active flag?

responses $=\{\}$

polling$\_$active $=$ True

while polling$\_$active:

name $=$ input$("$

What is your name? $")$

response $=$ input$("$Which mountain would you like to climb someday? $")$

responses$[$name$]=$ response

repeat $=$ input$("$Would you like to let another person respond? $($yes$/$no$)")$

if repeat $==\text{'}$no$\text{'}$:

polling$\_$active $=$ False

a$.$

It controls the order of execution of the code.

b$.$

It checks if the user's name is valid.

c$.$

It determines if polling should continue or stop.

d$.$

It counts the total number of responses.