How does a synthetic full backup enable a full backup copy to be created?

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How does a synthetic full backup enable a full backup copy to be created?
A . offline without disrupting the I/O operation on the production volume
B . offline with less I/O operation to create index pointers using fast copy
C . online with throttled I/O operation on the production volume
D . online with throttled I/O operation during index merge maintenance task

Answer: C