QUESTION $21$

What does the following code do$?$

SELECT@@autocommit

$$ a$.$ It gets the global value of the autocommit variable

b$.$ It gets the session value of the autocommit variable

c$.$ It gets the session value of the autocommit variable if it exists. Otherwise, it gets the global value.

d$.$ It gets the global value of the autocommit variable if it exists. Otherwise, it gets the session value.