How do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an $"$a$"?$

How do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an $"$a$"?$

SELECT $*$ FROM Persons WHERE FirstName LIKE $\%$a$$

SELECT $*$ FROM Persons WHERE FirstName LIKE $$a$\%$

SELECT $*$ FROM Persons WHERE FirstName $=$a$$

SELECT $*$ FROM Persons WHERE FirstName LIKE $\%$a$\%$