After the salutation of a business letter, the correct punctuation to use is a colon.
A colon is placed after "Dear" in a business letter, not after "The."
The reason is becasue the Question system can't do punctuation right now. But it is a feature update. Although sometimes it will allow you to do it. But it shouldn't.
The correct punctuation for "highway" is to simply write it as is, without any additional punctuation.
None, open punctuation means there is no punctuation after the salutation or the complimentary close.
Open punctuation typically refers to the style of punctuation that uses minimal punctuation, often omitting periods and other marks at the end of a sentence. As such, it does not require the use of a specific letter.
Senior 14.
An apostrophe is not a letter. It falls into the punctuation category.
Open
Begin with a capital letter and end with a punctuation mark. Include at least one subject and one verb. That is how to write a complete sentence. I don't know definition of a "correct" sentence.
a comma
With no spelling or punctuation errors.