You need to implement client-side animations according to the business requirements.
Which line of code should you use? (Each correct answer presents a complete solution. Choose all that apply.)
A. $ ("h1: first") .animate ({ opacity: 0 });
B. $("h1:first").fadeIn(1000);
C. $("h1:first").animate({ opacity: 1 });
D. $("h1:first").fadeOut(1000);