A Technician Would Like to Have the Ability to Add

Multiple Choice

A technician would like to have the ability to add physical hard drives to a Storage Spaces storage pool at future times on an as-needed basis.   
Which of the following Storage Spaces features describes this functionality without the need to also reconfigure the available space to users?

A) Three-way mirror
B) Thin provisioning
C) Resiliency
D) Two-way mirror
E) Parity