The first ever Shari'ah screening filter was developed in Malaysia by RHB. Since then there have been various methodologies developed by Shari'ah scholars to differentiate between investment in shares that are considered to be Shari'ah compliant and non- Shari'ah compliant. 

a. Explain the quantitative filters that are applied by the Dow Jones Islamic Market Index and provide a detailed rationale of why each filter is included.

b. Analyze and explain the differences between the commonly used filters, like the one applied by Dow Jones, with the Shari'ah screening methodology applied by the SAC of Bursa Malaysia?

c. The Dow Jones Islamic Index use the 33% rule in their quantitative filters. Where did this rule originate from? Explain your answer.