If the packing gland of a centrifugal water pump is leaking too much, you should
a) tighten up the gland until all leakage has been stopped
b) tighten up the gland but permit a slight amount of leakage
c) tighten up the gland as far as is possible
d) throttle the suction valve a little
e) tighten up the gland until there is 10% leakage
Answer: B