Which of the following methods will allow a CSS class to be added to an existing HTML element without overwriting its existing CSS class specifications?

Question $18$Answer

a$.$

theElement.class.append$("$newStyle$")$;

b$.$

theElement.classList.append$("$newStyle$")$;

c$.$

theElement.class.add$("$newStyle$")$;

d$.$

theElement.className.append$("$newStyle$")$;

e$.$

theElement.classList.add$("$newStyle$")$;

f$.$

theElement.className.add$("$newStyle$")$;