The suggested answer is B, E.
To distinguish between an iPhone and an iPad, HTTP and IF-MAP are the most appropriate fingerprint collectors. HTTP can use user-agent strings, which browsers and applications send that provide detailed information about the device type. IF-MAP (Interface for Metadata Access Points) can also help by sending metadata that helps in identifying device characteristics more precisely. Other methods like SNMP, MAC OUI, and TCP header capture are less effective for this specific purpose, as they either provide less detailed information or focus on different aspects of network communication or device identification.