Which of the following statement can retrieve the second field in a structure s$?$

Question $9$ options:

A$)$

fn$=$fieldnames$($s$)$;

x$=$s$.$fn$(2)$;

B$)$

fn$=$fieldnames$($s$)$;

x$=$s$.($fn$(2))$;

C$)$

fn$=$fieldnames$($s$)$;

x$=$s$.($fn$\{2\})$;

D$)$

fn$=$fieldnames$($s$)$;

x$=$s$.$fn$\{2\}$;