In 2015, the outgoing president of the International Association of Athletics Federations (IAAF) claimed "99\% of athletes are clean" (www.irishexaminer.com). However, based on a survey administered online, a sports reporter concluded that only \(30 \%\) of athletics fans agreed with the above statement. Based on their findings, they said that the IAAF president's statement was misleading. Identify the potential bias in the sports reporter's study that results from:

a. Sampling bias due to under coverage.

b. Sampling bias due to the sampling design.

c. Response bias.