Assume that x₁, x₂ and x₃ are the dollars invested by investor A in three different common stocks from Chicago Stock Exchange. The investor A requires that at least 50% of the dollars invested should be in "stock 1".

The constraint for this requirement can be written as:

Group of answer choices

x₁ 0.50

x₁ 0.50 (x₁ + x₂ + x₃)

0.5x₁ - 0.5x₂ - 0.5x₃ 0

x₁ - x₂ - x₃ 0.1

None of the above