Dates and references

Q. What do we denote by using the abbreviation 3230 BCE?

1. 3230 BCE refers to the year 3230, which has not arrived yet.
2. 3230 BCE refers to the year 3230, after common era.
3. 3230 BCE refers to 3230 years before common era.
4. 3230 BCE is a date that does not exist.

Q.

Write the opposite of $326BC$.

Q.

Express the following into Hindu-Arabic system:

$MDCCXXV$