Sample Questions: Java SE 5 and 6, Certified Associate (1Z0-850)

Option A is incorrect because a pixel cannot be used to calculate orbital mechanics equations.
Option B is incorrect because a boolean type cannot be used to calculate orbital mechanics equations.
Option C is incorrect because an integer type cannot be used to calculate orbital mechanics equations.
Option D is correct because floating point numbers are ideal for calculating orbital mechanics equations.
Option E is incorrect because an enumerated type cannot be used to calculate orbital mechanics equations.