The type of attack that Sherlin has made her store's network vulnerable to is B: Rogue access point.
A rogue access point is a device that is not sanctioned by an administrator but is operating on the network anyway. This could be an access point set up by an employee; for example, creating a wireless access point through a router.
As per the case where Sherlin secretly connected an inexpensive wireless router to the wired network of her store and provided unknowingly an open access to the wireless signal of the store's network; she ultimately made her store's network vulnerable to the rogue access point attack.
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