Yes the aurthor should know becaus he or her is the one that made it up
The second option because the purpose of a public service announcement is to raise awareness on an important issue.
Hello. Your question is incomplete and I would need more information to answer it accurately. However, to help you out, I'm going to show you what a transition signal is and some functions that they can get. I hope it helped you.
Transition signs are words, or sentences, that make connections between phrases, promoting cohesion in the text, where everything that has been written is related and fluid.
Transition signs can have many functions such as indicating the time the sentences were written, indicating a conclusion, emphasizing, indicating an enumeration or sequence, and adding extra information in the text.