Bob is responsible for securing a company's network that heavily relies on TCP and UDP for various applications, including NFS for file sharing. The organization is concerned about potential security vulnerabilities in these protocols.

$($i$)$ Identify and explain THREE $(3)$ security risks specific to NFS $($Network File System$).$

$($ii$)$ Based on your answer in $1($b$)($i$)$; recommend THREE $(3)$ security measures to enhance the security of NFS$,$ ensuring secure file sharing.

$($iii$)$ Discuss the role of firewalls and intrusion detection systems in protecting NFS$.$