Debug and fix this code. Then explain what was changed and why.

def display$\_$welcome$\_$message$()$:

$"""$Display the welcome message."""

print$("$Welcome$!$ Let's find an activity based on your preferences."$)$

def get$\_$who$\_$choice$()$:

$"""$Prompt the user to enter 'couple', 'group', or 'individual'."""

while True:

who $=$ input$("$Please enter who will be participating $($individual$,$ couple, group$)$ or None to exit: $").$lower$()$

if who in $[\text{'}$individual$\text{'},$ 'couple', 'group'$]$:

return who

elif who $==$ 'none':

return None

else:

print$("$Invalid input. Please enter 'individual', 'couple', 'group', or 'None' to exit."$)$

def get$\_$where$\_$choice$()$:

$"""$Prompt the user to enter 'indoors', 'outdoors', or 'river'."""

while True:

where $=$ input$("$Where will the activity take place? $($indoors$,$ outdoors, river$)$: $").$lower$()$

if where in $[\text{'}$indoors$\text{'},$ 'outdoors', 'river'$]$:

return where

else:

print$("$Invalid input. Please enter 'indoors', 'outdoors', or 'river'."$)$

def select$\_$activity$($who$,$ where$)$:

$"""$Return the activity based on who and where."""

activities $=\{$

$(\text{'}$individual$\text{'},$ 'indoors'$)$: 'Crafts',

$(\text{'}$individual$\text{'},$ 'outdoors'$)$: 'Biking',

$(\text{'}$individual$\text{'},$ 'river'$)$: 'Fishing',

$(\text{'}$couple$\text{'},$ 'outdoors'$)$: 'Hiking',

$(\text{'}$group$\text{'},$ 'indoors'$)$: 'Scavenger hunt',

$(\text{'}$group$\text{'},$ 'outdoors'$)$: 'Rock climbing',

$(\text{'}$group$\text{'},$ 'river'$)$: 'Tubing'

$\}$

return activities.get$(($who$,$ where$),"$No activity found for the given choices."$)$

def main$()$:

$"""$Main function to run the activity selection process."""

display$\_$welcome$\_$message$()$

while True:

who $=$ get$\_$who$\_$choice$()$

if who is None:

print$("$Exiting the program."$)$

break

where $=$ get$\_$where$\_$choice$()$

activity $=$ select$\_$activity$($who$,$ where$)$

print$($f$"$The selected activity for a $\{$who$\}$ in the $\{$where$\}$ is: $\{$activity$\}$

$")$

# Run the program

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

main$()$