Consider the following scenario involving two transactions, T$1$ and T$2$:T$1$: SELECT COUNT$(*)$ FROM Students WHERE age $>18$;T$2$: INSERT INTO Students $($name$,$ age$)$ VALUES $(\text{'}$John Doe', $19)$;Tl $($after T$2)$: SELECT COUNT$(*$ FROM Students WHERE age $>18$;Explain the phantom problem that occurs in this scenario. How can the phantom problem be prevented using appropriate isolation levels?