Select the protocol below that is used to synchronize clocks on computers on a network:?

If TAX_RATE is a named constant of type Decimal, which of the following statements is valid?

(A) TAX_RATE += 1 (B) dblVar = TAX_RATE + 1 (C) TAX_RATE = 2 * TAX_RATE (D) All of the above

The _______________ uniquely identifies each row in a table.

Fill in the blank(s) with the appropriate word(s).