Now a mother of two, Zakaria went to Tahrir with her friends on Wednesday to mark one of the most momentous days of her life.
The analyses focus on those who did mark one of the three answers, and it should be noted that these three categories are mutually exclusive.
Afghan men and women flocked to mosques and stadiums across the country today to mark one of the most hallowed occasions on the traditional calendar, the old Persian New Year, enjoying a celebration denied them by the Taliban.
Now Saudi Arabia is the mark; one of the most repressive tyrannies on the planet which already has one of the largest stocks of armaments (at $48bn, it was the seventh largest military spender in 2011).
That's mark one of the iPad.
His son Mark, one of Mr. Zander's six children, now runs it.
The season home run mark, one of baseball's cherished records, was established at 60 by Babe Ruth in 1927 and lasted 34 years.
One may wonder why Simon Stevens has chosen this controversial topic to mark one of his earliest interviews as head of the NHS.
If Mr. Bemba's claims are true, it would mark one of the largest losses of life in the two-year civil war.
If true, the blast would mark one of the highest single casualty tolls since the Syrian uprising began almost 14 months ago.
In October, at celebrations to mark one of the Egyptian army's most mythical victories, he invited a man convicted of assassinating his predecessor, Anwar Sadat.
