Numi Tea's positioning of its product line as upscale indicates that decisions regarding the marketing mix of product, price, place, and promotion would focus on which of the following combinations?

a$.$ Low quality, low price, wide availability, and heavy promotion.

b$.$ Low quality, higher price, exclusive availability, and heavy promotion.

c$.$ High quality, low price, narrow availability, and heavy promotion.

d$.$ High quality, higher price, exclusive availability, and lighter promotion.