Assuming all variables are positive, use properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms. (2 points) log base two of quantity x to the sixth power times y to the seventh power divided by eight. a) six times log base two of x plus seven times log base two of y minus log base two of eight. b) six times log base two of x minus seven times log base two of y minus log base two of eight. c) six times log base two of x times seven times log base two of y minus log base two of eight. d) six times log base two of x plus seven times log base two of y plus log base two of eight.