1) The marketing process is the process and relationship between the product, prices, and the how it will be advertisezed.the product is in relation with the other products that require batteries. The price is in relation of the prices if it's products and the use.
2) The four P's are product, price, place, and promotion. The product is what will be sold. The price is how much that product is worth in the market. The place is where they will be selling this product. The promotion is how they will be advertising such product.
3) Relationship marketing deals not only with the product itself but how the consumers feel about the product. This helps them determine where to sell such product and what areas would bring more profit and advertisement.