The correct active form of the given sentence is:

☀ We hold all meetings in the conference room.

Explanation for all options:

1. We hold all meetings in the conference room. - This is the correct active form. It directly states that "We" are the ones responsible for holding all meetings in the conference room, matching the original passive sentence's meaning.

2. We will hold all meetings in the conference room. - This option is also correct, but it indicates a future tense. It means that "We" will be responsible for holding all meetings in the conference room in the future. While the meaning is similar, it's in a different tense than the original sentence.

3. We are holding all meetings in the conference room. - This option is correct as well, but it indicates a present continuous tense. It means that "We" are currently in the process of holding all meetings in the conference room. Again, while the meaning is similar, it's in a different tense than the original sentence.

4. We held all meetings in the conference room. - This option is incorrect because it changes the tense of the sentence. The original sentence is in the present tense, while this option is in the past tense, which alters the meaning. It would mean that "We" held all meetings in the conference room in the past, not necessarily what is happening now.