Definitions of foreign policy can be listed as follows:

• the strategy or approach chosen by the national government to achieve its goals in its relations with external entities
• the sum of decisions made on behalf of a given political unit (usually a state) entailing the implementation of goals with direct reference to its external environment. Foreign policy inputs are those many factors that influence decision-making, whilst the observable outputs of foreign policy are a feature of state (and non-state) behavior within the international system
• A set of actions or rules governing the actions of an independent political authority deployed in the international environment
• Foreign policy in its traditional definition is the policy of a state towards external actors and especially other states. In contrast particularly to neorealism, it therefore does not primarily look at the international system as such but offers an ‘inside-out’ perspective to understand the decisionmaking process within a state that produces policies directed beyond the state
• The totality of a  country’s policies toward and interactions with the environment beyond its borders
• The totality whereby state actors act, react and interact. Foreign policy has been termed a boundary activity. The term ‘boundary’ implies that those making policy straddle two environments: an internal or domestic environment and an external or global environment. The policy makers and the policy system stand therefore at these junction points and seek to mediate between the various milieu
• Foreign policy is seen usually as the quintessential ‘boundary’ activity, at the interface between the domestic and the external spheres. While these spheres have never been completely separate, the boundary between them seems to have become more porous as a result of globalization – a multidimensional contested process that involves an increasing embedding of political, military, economic, social and cultural activities in politically unified (quasi) global spheres of activity

As can be understood from the information given the definitions which take place in the options I, II, III, IV and V are the definitons of foreign policy, so the correct answer is D. The definition taking place in the option VI is the definition of international relations.