According to the text, what is correct to say about Peter D'Adamo?
a) He is a Belgium scientist specialized in the area of nutrition.
b) He receives the support of other doctors to carry out his researches
c) He claims that Albert Einstein also followed the blood type diet to stay healthy.
d) He wrote a book, has a website and sells diet supplements based on his blood type diet.
e) He published the findings of his research on blood type diets after an eight-year long trial.