Question

Read the following greetings and state if they are formal o informa
a)
Good morning, Mr. Harry
b) Good afternoon, Mr. Sinha
c) Hello! how are you?
d) What a pleasant surprise!
po'
09
OS
58/OSS/1/302-A]
re
G-204
Hhnilaimaanaaliammai
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Answer 1

I think all the four options are informal