Here, the user can upload a file of size 5,000 bytes. The MAX_FILE_SIZE value in HTML form is used to define the maximum file size allowed. Since this restriction is on the client side, an attacker can easily set this parameter to an arbitrary value.
You can limit the filesize uploaded by a POST method by modifying a number of configuration directives in the PHP.ini file, such as post_max_size, max_input_time and upload_max_filesize.
Answer options A, B, and C are incorrect. These are not the valid answers according to the given question.