One of the strategic reasons to source component technology purchases from multiple providers is to:

A.
Avoid vendor lock-in.

B.
Influence governmental organizations.

C.
Keep vendor prices down.

D.
Encourage vendor control.

Explanation:
When it comes to building applications for the cloud, John Gossman, an employee of Microsoft, thinks agility
and portability are essential. “You don’t want to get locked in too much to a particular vendor, strategy,
technology, whatever,” he says.
Likewise, he added, you aren’t likely to last long if your plan is to pick a single public cloud vendor and host
everything there.
http://www.theregister.co.uk/2014/12/06/microsoft_linux_and_the_cloud/