Which of the following is/are the correct statement/s regarding letter writing?

(I) 'Yours faithfully' is used for ending a formal letter.

(II) The right sequence of writing a letter to the editor is - Sender's address, Receiver's address, Subject, Salutation, Body of letter, Subscription, Date.

(III) The right format of writing a date in all formal letters is '30th May, 2022' instead of '30/05/2022'.

(IV) 'Yours truly' is used for ending an informal letter.