Which definition of an OVA is true?

Which definition of an OVA is true?
A . It is an open standard to package and distribute a template to define the configuration of the virtual hardware of a virtual machine.
B . It is a proprietary standard to package and distribute a template to define the configuration of the virtual hardware of a virtual machine.
C . It is an open standard to package and distribute a template to define the configuration of the virtual software of a virtual machine.
D . It is proprietary standard to package and distribute a template to define the configuration of the virtual software of a virtual machine.

Answer: A