Sheila, a salesperson, plans to write an e$-$mail to one of her customers. Based on the do's of e$-$mail communication outlined by Marjorie Brody, identify the guidelines that should be followed by Sheila when writing the e$-$mail. $($Check all that apply.$)$

Multiple select question.

She should use texting language to give the e$-$mail a personal touch.

She should include a signature $($sig$)$ file at the end of the e$-$mail.

She should include dates, salutations, and a friendly closing in the e$-$mail.

She should use all capital letters to emphasize the message of the e$-$mail.