Answer Hint: Primary Health Care (PHC) is the key to achieving Health for All (HFA), making option (a) the most encompassing and correct concept related to the Alma Ata declaration.

Answer Hint: Screening is considered Secondary Prevention, as it involves early diagnosis and prompt treatment in pre-symptomatic stages of disease.

Answer Hint: Essential health care based on practical, scientifically sound and socially acceptable methods and technology made universally accessible to individuals and families in the community through their full participation and at a cost that the community and country can afford to maintain at every stage of their development in the spirit of self-reliance and self-determination.