Question

In Diary entry, the salutation can be written as:
1) Dear Friend
2) Dear Sir
3) Dear Diary
4) Dear Madam​

Answer 1

3) dear diary .

is the best answer

Answer 2

Answer :

If you want to tell your friends, Sir, Madam... anything you can't and you would like to open up your thoughts, which you want to tell, then you should start with it (friend, sir, madam)

if you are are writing a dairy daily by telling /saying what amazing things happen for that day... you should write, dear dairy

hope it helps you