The correct answer is option 3: Both 1 and 2.

Option 1 states that the total number of non-permanent members of the Security Council is now 10, but was originally only 6. This statement is correct. Currently, there are 10 non-permanent members on the Security Council, but when the United Nations was first established, there were only 6 non-permanent members.

Option 2 states that non-permanent members of the Security Council are elected for a term of two years only. This statement is also correct. Non-permanent members are elected by the General Assembly for a term of two years. After this term, a new set of non-permanent members is elected.

In conclusion, both statements are correct. The number of non-permanent members has increased from 6 to 10, and they are elected for a term of two years.