Among following methods, please select a method if that prints a $20-$byte cryptographically secure pseudo$-$random number.

$1$ hexdump $-$n $20-$C $//$dev$/$random

Bash

$1$ hexdump $-$n $20-\frac{C}{\frac{?}{?}}de\frac{v}{u}$random

Bash

$1$ with open$("//$dev$/$urandom$","$rb$")$ as f:

Python

$2r=f*read(20)$

$3$ print$(r)$

$1$ import os

Python

$2,r=$ os$.$urandom$(20)$

$3$ print$($r$)$