For a given class, the student records are stored in a file. The records are randomly accessed and updated. Assume that each student's record is of fixed size. Which of the three allocation schemes $($contiguous$,$ linked and table$/$indexed$)$ will be most appropriate?

Consider a file whose size varies between $4KB$ and $4MB$ during its lifetime. Which of the three allocation schemes $($contiguous$,$ linked and table$/$indexed$)$ will be most appropriate?