which is the proper use capital letters after a comma [closed]

Solution 1:

The first option is written incorrectly because the first letter of the names of people must be capitalized in a sentence.

The second option is written incorrectly because it is incorrect to capitalize the first letter of a word after a comma without reason. By default, they are left uncapitalized.

The following sentence's structure would work.

Hi Betty, thank you [for blah blah blah].