The correct answer is A. 1.
An FIR function of a digital signal processor possesses only one table, which is the impulse response table. The impulse response table contains the values of the impulse response of the FIR filter. The impulse response is the output of the filter when the input is a unit impulse.
The other options are incorrect because they do not represent the number of tables that an FIR function of a digital signal processor possesses.