Which virtual machine tier should you recommend?

An application currently resides on an on-premises virtual machine that has 2 CPU cores, 4 GB of
RAM, 20 GB of hard disk space, and a 10 megabit/second network connection.
You plan to migrate the application to Azure. You have the following requirements:
You must not make changes to the application.
You must minimize the costs for hosting the application.
You need to recommend the appropriate virtual machine instance type.
Which virtual machine tier should you recommend?

A.
Network Optimized (A Series)

B.
General Purpose Compute, Basic Tier (A Series)

C.
General Purpose Compute, Standard Tier (A Series)

D.
Optimized Compute (D Series)

Explanation:
General purpose compute: Basic tier
An economical option for development workloads, test servers, and other applications that don’t
require load balancing, auto-scaling, or memory-intensive virtual machines.
CPU core range: 1-8
RAM range: 0.75 – 14 GB
Disk size: 20-240 GB
Incorrect answers:
Not A: Network optimized: fast networking with InfiniBand support
Available in select data centers. A8 and A9 virtual machines feature Intel® Xeon® E5 processors. Adds
a 40Gbit/s InfiniBand network with remote direct memory access (RDMA) technology. Ideal for
Message Passing Interface (MPI) applications, high-performance clusters, modeling and simulations,
video encoding, and other compute or network intensive scenarios.
Not C: CPU core range: 1-8
RAM range: 0.75 – 56 GB
Disk size: 20-605 GB
Not D: D-series virtual machines feature solid state drives (SSDs) and 60% faster processors than the
A-series and are also available for web or worker roles in Azure Cloud Services. This series is ideal for
applications that demand faster CPUs, better local disk performance, or higher memories.
Virtual Machines Pricing. Launch Windows Server and Linux in minutes
http://azure.microsoft.com/en-us/pricing/details/virtual-machines/