Final answer:
A DHCP Discover message is sent by a client seeking an IP address. The source MAC address is usually all ones (FF-FF-FF-FF-FF-FF). The destination IP address is usually broadcasted to all IP addresses on the network.
Step-by-step explanation:
A DHCP Discover message is a message sent by a client seeking an IP address. So, statement (d) is correct. The source MAC address in a DHCP Discover message is typically all ones (FF-FF-FF-FF-FF-FF), hence statement (a) is correct. However, the destination IP address in a DHCP Discover message is usually broadcasted to all IP addresses on the network, not specifically to 255.255.255.255, so statement (b) is incorrect. Additionally, statement (c) is incorrect because a DHCP Discover message is sent by a client and not by a server offering an IP address.