The IRB Lets You Type in Commands and Small Code

question 15

Multiple Choice

The IRB lets you type in commands and small code snippets and to retrieve immediate results. The IRB command prompt consists of multiple parts separated by a colon as shown here: irb(main) :001:0> Which of these parts is incorrectly described below?

• A) (main) - Identifies the current class (in this case the main object)
• B) 001 - A three digit number showing Ruby's version number
• C) 0 - Represents the current queue depth when working with a class
• D) > - The end of the command prompt

---

Definitions:

Hemoglobin

Iron-containing respiratory pigment occurring in vertebrate red blood cells and in the blood plasma of some invertebrates.

Oxygen-rich Blood

Blood that has been oxygenated in the lungs and is being transported by the arteries to the rest of the body.

Mammary Glands

Specialized organs in mammals responsible for producing milk to nourish their young.

Constant Body Temperature

Pertains to the maintenance of a stable internal body temperature regardless of external conditions, characteristic of endotherms.