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A bitumen sample has been graded as $\text{VG}30$ as per $\text{IS:}73-2013$. The $'30'$ in the grade means that

  1. penetration of bitumen at $25^{\circ}C$ is between $20$ and $40$
  2. viscosity of bitumen at $60^{\circ}C$ is between $2400$ and $3600$ Poise
  3. ductility of bitumen at $27^{\circ}C$ is more than $30$ cm
  4. elastic recovery of bitumen at $15^{\circ}C$ is more than $30 \%$
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Answer is B
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