add 3 months to now() in sql code example

Example: sql server current date minus 5 years

SELECT GETDATE() 'Today', 
           DATEADD(day,-2,GETDATE()) 'Today - 2 Days'
SELECT GETDATE() 'Today', 
           DATEADD(dd,-2,GETDATE()) 'Today - 2 Days'
SELECT GETDATE() 'Today', 
           DATEADD(d,-2,GETDATE()) 'Today - 2 Days'