The correct answer to this open question is the following.
Although there are no options attached, we can answer the following.
The contextual factor involved whether your speaking situation is indoors or outdoors and whether you will be speaking in a large or small space is the speaking format you will use to correctly deliver your message.
When you are speaking inside an auditorium or conference room, you have to check the PA system, good microphones, and the correct distribution of the audio throughout the venue so all attendants can hear you well.
On the other hand, if you are speaking outdoors, and depending on the size of the audience, you have to get the support of a sound engineer because the weather influences the sound. If the wind is blowing, it can distort how the sound waves are transmitted. If it is a small audience, there are no more problems,. But if the venue is a stadium, then, you have to be very careful, including scheduling a soundcheck before the audience gets to the venue.