What is one important guideline for antenna selection?

An enterprise needs an upgrade to 802.11ac. Users run applications such as Web, email, voice, and video.
The architect needs to conduct an active site survey to plan 802.11ac AP locations. The noise floor is about -
90 dBm across the site.
Based on Aruba best practices, what is the minimum acceptable signal that the architect should look for to determine the test AP range?

Refer to the exhibit.

The customer needs to expand its wired and wireless network to a new building, Building 2, which is near the existing building, Building 1. The exhibit shows the logical plan that the architect has created so far.
The aggregation layer switches in the new building should provide the default gateway services for the VLANs in the new building and route traffic to the core. The existing Aruba Mobility Controllers (MCs) will control the new APs.
What should be the VLAN assignment for Link 1, indicated in the exhibit?

An architect needs to plan a very high density (VHD) wireless network at a large events venue, at which
thousands of attendees are expected. The architect plans to deploy a cluster of Mobility Controllers (MCs) to
control the APs. It is important to support seamless roaming for wireless devise across the venue.
What should the architect ensure for the network services?

A customer requires a wireless upgrade. The architect proposes:
* Aruba AP-325s
* Mobility Controller (MC) 7210s
* Virtual Mobility Masters (MMs)
* ClearPass
* AirWave
The customer is interested in wired authentication, as well as wireless authentication, but does not have the budget to upgrade the wired network. The wired network does not currently support 802.1X or RADIUS.
Which feature of the Aruba solution should the architect explain to justify the proposed solution?