Final answer:
At a minimum, an organization with six offices spread over three cities should plan to have three Active Directory sites, one for each city, to optimize network traffic and resource access.
Step-by-step explanation:
The question posed is related to planning Active Directory sites for an organization with offices spread across multiple cities.
Active Directory sites are usually defined by the physical network structure and aim to optimize network traffic.
In most cases, if each city has a well-connected network infrastructure internally, but connections between cities are less frequent or slower, an organization would likely create an Active Directory site for each city.
In this scenario, with six offices spread over three cities, at a minimum, you would need three Active Directory sites. This is because the sites should map to areas with reliable high-speed connectivity, which is typically within the same city.
This helps to minimize the bandwidth used for replication between sites and ensures that users have the quickest access to resources.
Therefore, the correct answer is B) Three.