If it is necessary for the data producer to determine the data sent to a certain task of the target Bolt, which of the following message publishing strategies should be selected?

If it is necessary for the data producer to determine the data sent to a certain task of the target Bolt, which of the following message publishing strategies should be selected?
A . Local field grouping
B . Broadcast grouping
C . Direct grouping
D . Global grouping

Answer: C