Which of the following when added as an impurity into silicon produces n-type semicondutor ?

Which of the following, when added as an impurity into the silicon, produces n-type semiconductor?

Which of the following when added as an impurity into the silicon produces n -type semi-conductor?

Which of the following , when added as an impurity, into the silicon, produces n-type semiconductor ?

Boron is added as impurity to silicon, the resultant semiconductor is:

Which one of the following elements, when present as an impurity in silicon makes it a p-type semiconductor?

Which one of the following elements, when present as an impurity in silicon makes it a p-type semiconductor?