Functions can be used to replace multiple code statements. This occurs in the Tic$-$Tac$-$Toe game program within the tutorial $2\mathrm{.}3\mathrm{.}5$ Finishing the Tic$-$Tac$-$Toe Program; see the printBoard function created there as an example.

What if we wanted to replace the following lines in the Tic$-$Tac$-$Toe game:

if board$[$row$][$col$]==\text{'}-\text{'}$:

board$[$row$][$col$]=$ playerTurn

validMove$=$True;

else:

print$("$Oops$,$ that spot was already taken. Please select another spot."$)$

validMove$=$False

with a function called check$\_$if$\_$empty. For the call to this function, we could use:

validMove $=$ check$\_$if$\_$empty$($board$,$row,col,playerTurn$)$

where we input into the function the board, row, column and which player just made a selection $($playerTurn$),$ and it returns True if the space is empty or False if it is not to validMove.

Which code segment properly implements this function?

def check$\_$if$\_$empty$($board$,$ row, col, playerTurn$)$:

if board$[$row$][$col$]==\text{'}-\text{'}$:

board$[$row$][$col$]=$ playerTurn

return True

else:

print$("$Oops$,$ that spot was already taken. Please select another spot."$)$

return False

def check$\_$if$\_$empty$($board$,$ row, col, playerTurn$)$:

if board$[$row$][$col$]==\text{'}-\text{'}$:

board$[$row$][$col$]=$ playerTurn

return False

else:

print$("$Oops$,$ that spot was already taken. Please select another spot."$)$

return True

def check$\_$if$\_$empty$()$:

if board$[$row$][$col$]==\text{'}-\text{'}$:

board$[$row$][$col$]=$ playerTurn

return False

else:

print$("$Oops$,$ that spot was already taken. Please select another spot."$)$

return True

def check$\_$if$\_$empty$($board$,$ row, col, playerTurn$)$:

if board$[$row$][$col$]!=\text{'}-\text{'}$:

board$[$row$][$col$]=$ playerTurn

return True

else:

print$("$Oops$,$ that spot was already taken. Please select another spot."$)$

return False