ITMC 2018 Grade 6 National Preliminary set01 Question 13

Let $a>0$. Consider: (1) $2a$ is always greater than $a$; (2) $a^2$ is always greater than $a$; (3) $0.5a$ is always less than $a$; (4) $0a$ is always less than $a$. How many statements are true?