I use this card's effect to give one of my other Digimon <Security Attack +1>. If this Digimon is then removed from my battle area later in the turn, does the <Security Attack +1> effect also go away?

Can I use this Digimon's effect to target [Birdramon] itself?

I use this card's effect to give one of my other Digimon <Security Attack +1>. If that Digimon digivolves, does it retain <Security Attack +1>?