Question: Select each choice that is a true statement. There may be more than one correct choice. ( a ) If x = yR , then

Select each choice that is a true statement. There may be more than one correct choice.
(a) If x = yR, then y = xR.
(b) If x = y, then xR = yR.
(c) There exists a string such that x = xR.
(d) nb(x)+ nb(y)= nb(xy).

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