Answer :
The address delivered is a respectful association of appreciation. The level of formality is communicated in the model of formal communication. So, option(c): "formal" is the correct answer.
What is a formal speech or communication?
When speaking to someone you don't know or on whom you wish to create a good first impression, formal language is utilized.
Formal speech or behavior is more formal and serious than casual and friendly, and it is employed mostly in official settings.
A formal speech is a sort of speech that is prepared in advance and delivered to a large audience at a formal or professional event.
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