Delete the content without resetting the auto increment?

Which of the following command will delete the entire contents of a table without resetting the auto increment value?

a) drop table <tablename>
b) delete from <tablename>
c) truncate table <tablename>
d) remove table <tablename>



I think the answer should be
b) delete from <tablename>

because truncate resets the auto increment id value to 1.
Please share if your answer differs...