Which of the following EC mechanisms are used by Zappos to foster its relationship with customers?

Which of the following is a definition of the covariance between X and Y?

A. Correlation between X and Y times variance of X times variance of Y B. Variance of X times the variance of Y C. Correlation between X and Y divided by the product of the standard deviation of X and the standard deviation of Y D. Correlation between X and Y times standard deviation of X times standard deviation of Y

In the Luxottica case study, outsourcing enhanced the ability of the company to gain insights into their data

Indicate whether the statement is true or false