The number of sigma ($\sigma$) and pi ($\pi$) bonds in pent-2-en-4-yne is:

1. A
   $10\sigma$ bonds and $3\pi$ bonds
2. B
   $8\sigma$ bonds and $5\pi$ bonds
3. C
   $11\sigma$ bonds and $2\pi$ bonds
4. D
   $13\sigma$ bonds and no $\pi$ bonds