Other things held constant, which of the following alternatives would increase a company's cash flow for the current year?

Question $8$ options:

a$)$

Pay down the accounts payables.

b$)$

Reduce the days' sales outstanding $($DSO$)$ without affecting sales or operating costs.

c$)$

Pay workers more frequently to decrease the accrued wages balance.

d$)$

Increase the number of years over which fixed assets are depreciated for tax purposes.

e$)$

Reduce the inventory turnover ratio without affecting sales or operating costs.