You plan to deploy 60 virtual machines to a new subnet in VNet1. You need to create the subnet by using the smallest possible address range. Which subnet prefix should you use?

Why: Azure reserves 5 addresses in every subnet (network address, default gateway, two for Azure DNS, and broadcast). A /27 gives 32 − 5 = 27 usable addresses and a /26 gives 64 − 5 = 59 — both are too small for 60 VMs. A /25 gives 128 − 5 = 123 usable addresses, the smallest prefix that fits. A /24 (251 usable) also works but wastes address space, so it doesn't meet the "smallest possible" requirement.