Which of the following statement is true?
a) Likelihood is the probability that we observe the data=x once by varying the parameter controlling the distribution.
b) Likelihood is the probability that we observe parameter once the distribution of data is defined.
c) Likelihood is the probability that we observe the data=x once the parameter controlling the distribution is fixed.
d) Likelihood is probability of observing the data=x and has no correlation with the parameter controlling the distribution.