For the following sample dataset x=[1, 8, 5, 9, 12, 28], first find its variance. Then, use the result to calculate the variance of a new dataset y related to the given dataset by y = 3.5 * 2.2 * x.
a) Variance of x is 63.83, variance of y is 3168.17.
b) Variance of x is 28.33, variance of y is 1415.83.
c) Variance of x is 52.17, variance of y is 2608.50.
d) Variance of x is 42.83, variance of y is 2141.50.