i'd like to ask about the meaning of "credible" and "secure" in the following context:
in multiparty pluralistic elections the availability of credible alternative choices depends on the political parties having secure opportunities for financing election campaigns and routine operations.
does "credible" imply genuine here, i.e. Really different choices? yes
the basic meaning of "credible" is 'believable'. In that sentence "credible" does imply 'genuine','real'. Just by definition "credible" doesn't mean 'different', but in reality political parties practically always have some differences.
and does "secure" mean stable? yes.....stable, reliable (maybe you can even say 'guaranteed')