Which code block should you use?

You need to add a new column named Confirmed to the Attendees table.
The solution must meet the following requirements:
Have a default value of false.
Minimize the amount of disk space used.
Which code block should you use?
A. ALTER TABLE Attendees
ADD Confirmed bit DEFAULT 0;
B. ALTER TABLE Attendees
ADD Confirmed char(l) DEFAULT ‘1’;
C. ALTER TABLE Attendees
ADD Confirmed bit DEFAULT 1;
D. ALTER TABLE Attendees
ADD Confirmed char(l) DEFAULT `1′;

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