Wi-Fi uses 802.11 radio signals, so the client device (for example, a laptop or smartphone) does not need an Ethernet cable to communicate with the wireless access point. Ethernet cabling is only used on the wired side of the network, such as between the access point and the router or modem. Therefore, the correct statement is that no Ethernet cable is required between the wireless client and the access point; the other options incorrectly state that one or more Ethernet cables are necessary.
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