Which of the following statements are correct. Answer using the codes given below :

a.    Ascertainment of goods for sale is done by buyer.
b.    Appropriation of goods for sale is done by seller.
c.    Distinction between ascertainment of goods and appropriation of goods that former involves “the element of common intention between buyer and seller”, whereas later can be a unilateral act by buyer.
d.    Property in goods does not pass to buyer till appropriation.
Codes :