The life of pastoral groups is sustained by a careful consideration of a host of factors. Which of the following is true with context to this ?

A
They had to judge how long the herds could stay in one area
B
They need to calculate the timings of their movements, and ensure that they could move through different territories
C
They had to set up a relationship with farmers on the way, so that the herbs could graze is harvested fields and manure the soil
D
All the mentioned above.

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