In a cash-flow diagram :

A)
Time 0 is considered to be the present
B)
Time 1 is considered to be the end of time period 1
C)
A vertical arrow pointing up indicates a positive cash flow
D)
All of the above

Correct Answer :   All of the above


Explanation :

* Time 0 is considered to be the present
* Time 1 is considered to be the end of time period 1
* A vertical arrow pointing up indicates a positive cash flow
* An arrow pointing downward indicates a negative cash flow