Which of the following are correct, according to Raddon $(2010),$ about positivism and interpretivism?Select one or more: a$.$ Ontology refers to the generation of knowledge.b$.$ Positivism concerns objective knowledge, interpretivism concerns subjective knowledge. c$.$ Positivism is linked to methods like surveys & questionnaires; interpretivism is linked to methods like interviews and focus groups.d$.$ Data should be numerical for both positivism and interpretivism.e$.$ Positivism is more qualitative; interpretivism is more quantitative and statistical.f$.$ Positivism uses deductive reasoning; interpretivism uses retroductive reasoning.