Identify the sequence of processes in sewage treatment:
- AFiltration $\rightarrow$ Sedimentation $\rightarrow$ Biological treatment $\rightarrow$ Anaerobic sludge digesters
- BSedimentation $\rightarrow$ Filtration $\rightarrow$ Biological treatment $\rightarrow$ Anaerobic sludge digesters
- CFiltration $\rightarrow$ Sedimentation $\rightarrow$ Anaerobic sludge digesters $\rightarrow$ Biological treatment
- DSedimentation $\rightarrow$ Filtration $\rightarrow$ Anaerobic sludge digesters $\rightarrow$ Biological treatment
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