Which of the following are true statements about the expression 6 + (-6)6+(−6)6, plus, left parenthesis, minus, 6, right parenthesis? Choose all answers that apply: Choose all answers that apply: (Choice A) A The expression describes the number that is 666 to the left of 666 on the number line. (Choice B) B The expression describes the number that is 666 to the right of 666 on the number line. (Choice C) C The expression equals 000. (Choice D) D The expression equals 121212.