$3.$ Create a table "contacts" which includes contact$\_$id $($integer type$),$ first$\_$name $($character data type of length $30),$ last$\_$name $($character data type of length $25).$

a$)$ Create a trigger to insert contact$\_$id$,$ created$\_$by$,$ creation$\_$date into contacts$\_$audit table after inserting rows into contacts table. created$\_$by

in contacts$\_$audit table is the full name taken from first$\_$name and last$\_$name of table contacts.

b$)$ Create a trigger to insert contact$\_$id and deletion$\_$date before any row is getting deleted from contacts table.