I'm not sure if any of the options fit me well, but the first one comes the closest. I'm never 100% open, but I will reveal certain aspects of myself to some people. My family sees one side, my friends another, and people who are getting to know me see another. For example, I don't talk about my hopes and dreams with my family, but I'll talk to them about health, finances, politics, frustrations at work, and relationships. I won't talk to people I don't know well about my relationships or philosphies, but I can reveal things about my character that my friends and family don't know. A lot of it depends on my mood as well. Sometimes, you just need to talk.
The things that matter the most to me are the things I won't talk about to anyone. I've never known anyone I could talk to about anything and everything. It makes me feel vulnerable, and I'm afraid of being vulnerable.