Feynman Diagrams

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1. The problem statement, all variables and given/known data
Draw the Feynman diagram vertex corresponding to the interaction L_int = eA^μJ_μ,
where A^μ is the electromagnetic field and e is the coupling constant. Draw all the Feynman
diagrams in quantum electrodynamics to O(e2) describing the processes:
(i) e+e- ----> e+e-,
(ii) e+e- ----> μ+μ-
(iii)γ e- ------> γ e-


2. Relevant equations


Any ideas on how i should approach this question?