Take those two for instance:
They collect dividends from the underlying stocks for a whole year and pay out once a year. What happens to the dividends collected throughout the year, are they being reinvested until being paid out, or does Vanguard holds onto the cash for the whole period? Or does the answer lie somewhere in between (explaining the various dates: ex-dividend, record, payable).
I am aware of accumulation funds but this question is specifically about how income/distributing funds handle dividends throughout the year.