What property of ARP causes a reply only to the source sending an ARP request?

Question:
What property of ARP causes a reply only to the source sending an ARP request?

• The source MAC address appears in the header of the Ethernet frame.
• The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.
• The type field 0x806 appears in the header of the Ethernet frame.
• ARP replies are broadcast on the network when a host receives an ARP request.

Exam with this question: CCNA 1 v7 Modules 8 – 10 Exam Answers