Jason is attending the CompTIA Partner's Summit convention this year. While at the conference, Jason will need to ensure his smartphone has enough battery power to last the entire day without having to recharge it since it is hard to find an available electrical outlet in the conference rooms. Jason needs to ensure his smartphone is always available for use in order to receive updates from his team back home, as well. Which of the following would you recommend Jason use to ensure he can use the phone all day without his smartphone running out of power? A. Use a wireless charging pad
B. Bring a power strip so that more than one person can use an electrical wall outlet
C. Set the smartphone to airplane mode
D. Use a smartphone case with a built-in battery