Which of the following is used to facilitate communications with a user's smartphone in order to make purchases and payments by proximity?

_________________________ is the amount of moisture in the air.

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

In C, the individual characters in a string can be input, manipulated, or output using standard array-handling techniques utilizing either subscript or pointer notations.

Answer the following statement true (T) or false (F)