JEE Main 2009 Chemistry question

The set representing the correct order of ionic radius is :

• (1)Li^+ > Be^{2+} > Na^+ > Mg^{2+}
• (2)Na^+ > Li^+ > Mg^{2+} > Be^{2+}Correct
• (3)Li^+ > Na^+ > Mg^{2+} > Be^{2+}
• (4)Mg^{2+} > Be^{2+} > Li^+ > Na^+