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What feature describes straight rods used in hair styling?

  1. Unequal diameter along their length

  2. Diameter decreases from middle to ends

  3. Equal in diameter along their entire length

  4. Only suitable for long hair

The correct answer is: Equal in diameter along their entire length

Straight rods used in hair styling are typically required to have equal diameter along their entire length. Options A and B, provide features that may lead to curls or kinks rather than straight hair. Option D suggests that straight rods are only suitable for long hair when they can actually be used on hair of varying lengths. Therefore, option C is the most accurate and appropriate answer.