A system has $32$ bit virtual address, $64$ KB physical memory, and page size of $1024$ bytes. The operating system of that system also has the following page table snippet:

Page Frame

$0000000000000010000000111000$

$0000000000000010000001000111$

$0000000000000010000010111111$

$0000000000000010001010000000$

$($a$)[10$ points$]$ What is the size of the virtual address space in GB$?$ Put the answer in the box below.