Identify the correct statement about plasmids.

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Some unmodified wild$-$type plasmids have a copy number of $500$ or greater.

Cells can carry multiple types of plasmids, but the copy number of each plasmid will be the same.

Plasmids have origins of replication on them that allow them to be replicated independently of the main chromosome.

The larger the plasmid, the higher the copy number is likely to be$.$