Which of these processes will lower the glass transition temperature of a glass?

1 - Increase the cooling rate
2 - Decrease the cooling rate
3 - Increase amount of network modifier
4 - Decrease amount of network modifier
5 - Quench the glass to cool the surfaces quickly
6 - Decrease the number of defects

Read the introduction of this article very carefully.

https://en.wikipedia.org/wiki/Glass_transition