What describes multiple LUN snapshots?

What describes multiple LUN snapshots?
A . Captures multiple point-in-time data states.
Snapshot data state is marked "unmodified” from its source when attached.
Snapshot tree supports multiple simultaneous attaches.
B . Captures multiple point-in-time data states.
Snapshot data state is marked "unmodified” from its source when attached.
Snapshot tree supports only one attach at a time.
C . Captures multiple point-in-time data states.
Snapshot data state is marked "modified" from its source when attached.
Snapshot tree supports multiple simultaneous attaches.
D . Captures multiple point-in-time data states.
Snapshot data state is marked "modified" from its source when attached.
Snapshot tree supports only one attach at a time.

Answer: D