Moving digits around to a different place when counting up or down past 9 is called regrouping, borrowing, or trading.
There are several terms for moving digits around, some of them are:
- Regrouping
- Carrying
- Borrowing
- Trading
All the above mean the same thing, and they perform the same purpose.
For instance:
Counting from 19 to 20 involves borrowing/carrying/trading/regrouping of 1
Hence, the correct option is (d) all of the above
Read more about regrouping at:
https://brainly.com/question/23796432
