Select the phrase/connector from the given three options which can be used to form a single sentence from the two sentences given below, implying the same as expressed in the statement sentences.
The term mechanization is often used to refer to the simple replacement of human labour by machines. Automation generally implies the integration of machines into a self-governing system.
1. although
2. only if
3. so
1
Only 1
2
Only 2
3
Only 3
4
Both 1 and 2
5
None of these