T$\_$Headphone$($HeadphoneID$,$ SerialNumber, Model, Make, Year$)$

FD: HeadphoneID $$ SerialNumber, Model, Make, Year

$*$Note: Year had a mixture of numbers and strings

$($e$.$g$.,$ 'Twenty$-$Fifteen, Twenty$-$eighteen, $2021,2023\text{'}$

was shown all in a single cell of a data table.$)$

$(3$points$)$

$0$NF

$1$NF

$2$NF

$3$NF