Final answer:
Workstation1 uses the MAC address of Workstation2, which is '000b5f2a2222', as the destination address in the Ethernet frame header when sending a packet on the same local network.
Step-by-step explanation:
When Workstation1 sends an IP packet to Workstation2, the destination address that would be put in the Ethernet frame header is the MAC address of Workstation2. Assuming the network configuration informs Workstation1 that Workstation2 is on the same local network, it will use ARP (Address Resolution Protocol) to find out Workstation2's MAC address. Therefore, the correct answer is b. 000b5f2a2222, which represents the MAC address of Workstation2. It is important to note that the MAC address of the router would be used only if the packet were being sent to a different network.