Your friend Hui is an investor in bluecoin, a virtual currency. Indicate whether and how she is subject to Federal income taxation in the following circumstances 

a. Earns $1,000 in bluecoin from mining. 

b. Purchases $1,000 in bluecoin from another friend. 

c. Sells the purchase in part (b) in the market to a third party for $1,400. 

d. Spends $1,000 of bluecoin to acquire an asset worth $1,500. 

e. Spends $1,000 of bluecoin to acquire an asset worth $750. 

f. Holds bluecoin that she bought in February for $1,000. On December 31, the bluecoin is worth $1,200.