Circuit boards for wireless telephones are etched, in an acid bath, in batches of 100 boards. A sample of seven boards is randomly selected from each lot for inspection. A particular batch contains two defective boards; and x is the number of defective boards in the sample. P(x = 2) is _______. a. 0.8642 b. 0.0034 c. 0.1315 d. 0.0042 e. 0.6134