First P of the marketing mix

Which of the following is part of the first P of the marketing mix, product?
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a
A half page newspaper advertisement for Kellogg’s Corn Flakes in the Daily Mail.
b
A shop that sells Kellogg’s Corn Flakes.
c
Kellogg’s Corn Flakes and the box containing the Kellogg’s Corn Flakes.
d
Kellogg’s Corn Flakes.
e
The box containing the Kellogg’s Corn Flakes