Correct Answer:
Explanation/Reference:
Note:
* To make any changes to the search topology in a search installation that has items in the search index, you first have to create a new topology object.
You modify this new topology object, a clone of the active topology, by adding or removing search components. After you have made the changes to the clone topology object, you make the clone the active topology.
* SharePoint 2013 uses the web-based interface to show the current status of the topology. You change the topology by using Windows PowerShell.
* The New-SPEnterpriseSearchServiceApplication adds a search service application to a farm
This cmdlet is used when the search functionality is first configured or when a new shared search application is added to a farm.
SPEnterpriseSearchServiceApplication represents a self-contained aggregation of indexed content and properties available for search, and provides an anchor class for setting global search properties. A farm can include multiple search service applications.
Reference: Manage search components in SharePoint Server 2013