Transactions T$1,$ T$2,...,$ Tn are executed under two$-$phase locking policy. They follow $$all locks $$ process $$ all unlock$$ execution. Select all situations from the following list that could occur under this execution. Give your reason very briefly $(8$ points$).$

i$.$ The execution could generate redundant locking.

ii$.$ One or more transactions could be rolled$-$back multiple times.

iii.$$ Two or more transactions could involve in a cycle.

iv$.$ There could be a possibility of cascade roll$-$backs.

v$.$ A transaction could read dirty data $($dirty read$).$

vi$.$ Update of a transaction could be lost $($lost update$)$

vii.$$ Transaction response time will be good $($quick response$).$

viii.$$ Locking overhead will be high.

ix$.$ Transaction roll$-$back as a result of conflict will be very few.