The graph shows the relationship between the number of shares of stock from Company A, , and the number of shares of stock from Company B, , that Simone can purchase.

Based on the graph, what does the -intercept represent in this context?
The maximum number of shares of Company A Simone can purchase if she buys no shares of Company B.
The maximum number of shares of Company B Simone can purchase if she buys no shares of Company A.
The total number of shares Simone can purchase from both companies.
The cost per share of Company B stock.