C application conenct database Mysql

Question

C application:
C1. It must allow marking as valid each vehicle, by a function intended for that purpose, and will change the value of the field "valid" to "1" in the table objects.

C2. Should enable the marking of each vehicle to be invalid by a function created for this purpose, and that will change the value of the field "valid" to "0" in the table objects.

C3. Should display a menu that allows to identify which is the car that you want to mark as valid or invalid

C4. One of the options in this menu should be check / uncheck all cars at once.

Help me