Poultry farming is the practice of raising domesticated birds for various purposes. It is a popular agricultural activity that involves rearing different types of poultry, such as chickens, ducks, turkeys, and geese. Poultry farming has several objectives, including egg production, feather production, and chicken production.

Egg Production:
- One of the main purposes of poultry farming is to produce eggs. Chickens are primarily raised for their ability to lay eggs, and they are the most commonly used poultry for egg production.
- Eggs are a rich source of protein and essential nutrients, making them an important part of the human diet. Poultry farmers focus on maximizing egg production by providing the birds with a suitable environment, proper nutrition, and adequate healthcare.
- Chickens that are specifically bred for egg production are known as laying hens or layers. These birds are selected for their high egg-laying potential and are managed to optimize egg production.

Chicken Production:
- Poultry farming also aims to produce chickens for meat consumption. Chickens raised for meat are known as broilers or meat birds.
- Broilers are bred and raised to have a fast growth rate and reach market weight within a relatively short period. Poultry farmers provide them with specialized diets and ensure optimal living conditions to promote rapid growth and high-quality meat.
- Chicken meat is a popular source of protein and is consumed worldwide. Poultry farming plays a crucial role in meeting the growing demand for chicken meat.

Feather Production:
- Feathers are another valuable product obtained from poultry farming. Poultry feathers have various uses, including in the production of pillows, mattresses, cushions, and down jackets.
- Certain poultry species, such as ducks and geese, are particularly bred for their feathers. These birds have a higher feather density and produce feathers of better quality.
- Poultry farmers may engage in feather production as a supplementary income source or as a primary focus, depending on market demand and availability of suitable poultry breeds.

Milk Production:
- Milk production is not a primary objective of poultry farming. Milk is mainly obtained from mammals, such as cows, goats, and sheep. Poultry birds, including chickens, do not produce milk.

In conclusion, poultry farming is undertaken primarily for egg production and chicken production. Feather production can also be a secondary objective, but milk production is not associated with poultry farming. Therefore, option (a) - (a) and (c) are correct - is the correct answer to this question.