Which of the following are true about equivalent payment streams?

Now must always be used as the focal date.

Calculations will usually be simplified if you locate the focal date at of the unknown payments in the new stream.

A payment stream's equivalent value $($at a focal date$)$ is the sum of the equivalent values of all of its payments.

A different focal date may be used for each stream.

Two payment streams are economically equivalent if they add up to the same amount.