Answer:
a. unanimously by all sixty-nine electors.
Step-by-step explanation:
In the first ever presidential election of 1789, George Washington was was unanimously elected as president of the United States by all all sixty-nine electors.
George Washington was the most viable choice as president because of his contributions towards national integration was highly acclaimed by all.
Today the legacy of being the first president of U.S and the only president to have been unanimously elected by the Electoral College is remembered by all.