An organization wants each of five buildings to be on its own subnet. Each campus will need a minimum of $25$ IP addresses. The organization has the Class C network address $217\mathrm{.}105.2\mathrm{.}0$ assigned to it$.$ Using CIDR, what subnet mask will the minimum number of subnetworks with the maximum number of hosts per network that will meet the requirements of the organization?

Group of answer choices

$/29$

$/27$

$/28$

$/26$