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I Need The Feynman Diagram Of The Following Particle Physics Question

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A famous toy model in quantum field theory is the scalar {D3 theory. The only field
in the theory is a neutral scalar (spin—zero) particle, which is represented by a line
without an arrow, and the only vertex in the theory is where three scalar lines meet. (a) Draw all the leading-order Feynman diagrams for the elastic scattering of two
such scalars. As before, label the external momenta to help you make sure that
you obtain all of the diagrams. (b) Now do the same for the process of one scalar decaying into three scalars. Which
of these two processes [(a) or (b)] has more independent diagrams? Science