Map the student into relational schema

a$.$ student $($roll no$,$ first$\_$name, last$\_$name, birthdate, phoneno$)$

b$.$ student $($roll no$,$ first$\_$name, last$\_$name, birthdate, phoneno$)$

phone$\_$student$($phoneno$,$ roll no$)$

c$.$ student $($roll no$,$ name, birthdate, phoneno$)$

phone$\_$student$($phoneno$,$ roll no$)$

d$.$ student $($roll no$,$ first$\_$name, last name, birthdate$)$

phone$\_$student$($phoneno$,$ roll no$)$

e$.$ none of these