What is the opening phrase in the letter? 1.Best wishes, Toni 2.Dear, Alex, 3.I look...

Question

What is the opening phrase in the letter?
1.Best wishes, Toni 2.Dear, Alex, 3.I look forward to hearing from
you

Answer 1

Dear,Alex
дорогой, Алекс.
это и есть вводная конструкция.

Answer 2

Dear Alex, по-моему очевидно))