21. One of the following statements is correct about the RAM: a. Stores the bits in binary cells b. Supports the read operation but does not support the write operation c. Does not require a decoder in its internal construction d. None of the above 22. The BCD-to-seven-segment decoder is a combinational circuit that accepts a BCD digit as input and displays it as a decimal digit as in the following example: 1001 seven-segment decoder 9 In order to implement this circuit using a PAL circuit or a combinational circuit, we find that: a. The PAL requires more inputs than the combinational circuit b. The PAL requires more outputs than the combinational circuit c. The PAL and the combinational circuits require the same number of inputs and outputs d. None of the above