What is the purpose of performing a high $pH$ permeate flush right after a high $pH$ chemical cleaning.

a$.$ Kill bacteria

b$.$ Restore membrane functional groups

c$.$ Reduce scaling potential

d$.$ Both a$.$ & b$.$ are correct

e$.$ Both b$.$ & c$.$ are correct

f$.$ a$.,$ b$.$ and c$.$ are correct

g$.$ None of the above is correct