Need help with activity type in CampaignLog.

Hi,

I'm trying to update the CampaignLog through the API. I'll be updating actions such as Sent, Clicked, Opened, 

Bounced, Opted Out, Marked As Spam. I need to know the alternatives for all these that I can update to the activity_type field.

Based on my checking, I have seem some values such as targeted, error, removed, viewed but I'm not sure which corresponds to which. Can anyone help me find the activity type for the six activities I mentioned.

Thanks for the help!