Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
Plugged it in, turned it on and it worked!  Other than changing the  password, I left all other settings at the defaults.
Black Ice has been  totally quiescent since the install last week-end rather than the ten to  thirty hits we were getting per day.
I'm sold on it.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive