Answer:
formal
Step-by-step explanation:
With the family and the friends and people with whom we have intimacy we use a more relaxed language, that is, an informal language. With hierarchical superiors, or with a large crowd where we do not have intimacy with people we use a more careful language, that is, a formal language. Thus, we can conclude that in "The Swan", the feeling that the speaker is addressing a large audience creates a formal tone.
Formal language can also be named as formal registration. It is used when there is no familiarity between the communication interlocutors or in situations that require more seriousness.