Final answer:
George Washington's presidency is noted for the establishment of the federal court system through the Judiciary Act of 1789, which was a significant aspect of his administration. Moreover, he expanded presidential powers by appointing heads of federal departments as his advisors.
Step-by-step explanation:
An important part of George Washington's presidency was the establishment of the federal court system. This was achieved through the Judiciary Act of 1789, which laid the foundation for the judicial branch as we know it today. Among the listed options, A) Establishment of the federal court system is correct.
Additionally, Washington expanded the power of the presidency by appointing the heads of various federal departments as his own advisors. This was a significant step in shaping the executive branch and setting precedents for future presidents. Hence, from the given options in the second part, B) He appointed the heads of various federal departments as his own advisors is the way George Washington expanded the power of the presidency.