What is the effect on net sensitivity and net specificity of this method of screening?

A colon cancer screening study is being conducted in Nottingham, England. Individuals 50 to 75 years old will be screened with the Hemoccult test. In this test, a stool sample is tested for the presence of blood.
6. If the Hemoccult test result is negative, no further testing is done. If the Hemoccult test result is positive, the individual will have a second stool sample tested with the Hemoccult II test. If this second sample also tests positive for blood, the individual will be referred for more extensive evaluation. What is the effect on net sensitivity and net specificity of this method of screening? [ONE POINT]

a. Net sensitivity and net specificity are both increased
b. Net sensitivity is decreased and net specificity is increased
c. Net sensitivity remains the same and net specificity is increased
d. Net sensitivity is increased and net specificity is decreased
e. The effect on net sensitivity and net specificity cannot be determined from the data