What is the minimum number of servers required for the deployment?

You plan to deploy a SharePoint Server 2013 server farm.
You identify the following requirements:
 The farm must be available if a single server fails.
 The farm must support the creation of service applications.
 All search components must be available if a single server fails.
 Microsoft SQL Server database and SharePoint Server 2013 must not be deployed to the same
servers.
What is the minimum number of servers required for the deployment?

A.
2

B.
3

C.
4

D.
0

Explanation:
A three-tier farm configuration consists of two front-end web servers, an application server, and a
database server.