If the architecture describes the design by specifying gates

If the architecture describes the design by specifying gates. Flip-flops, other hardware their interconnections it is called behavioral description structural description combinational description hardware description

Solution

Ans is 3

Because Combinational circuit is a circuit in which we combine the different gates in the circuit, for example encoder, decoder, multiplexer, demultiplexer, flip flop.

So it will be the Combinational description.