$92\mathrm{.}6\%$ complete

Question

A medium$-$sized organization is upgrading its network infrastructure to secure its enterprise infrastructure by implementing an intrusion prevention system $($IPS$)$ and an intrusion detection system $($IDS$).$ The organization has sensitive data in different security zones, and the IT manager has concerns regarding the attack surface and network connectivity. Which of the following placements of the IPS$/$IDS devices would be MOST effective in this scenario?