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Each question is followed by two statements, I and II. Answer each question using the following instructions.

• Choose $1$ if the question can be answered by using one of the statements alone, but cannot be answered using the other statement alone.
• Choose $2$ if the question can be answered by using either statement alone.
• Choose $3$ if the question can be answered by using both statements together, but cannot be answered using either statement alone.
• Choose $4$ if the question cannot be answered even by using both statements together.

There are two straight lines in the $x-y$ plane with equations $ax + by = c, dx + ey = f.$ Do the two straight lines intersect?

1. $a, b, c, d, e$ and $f$ are distinct real numbers.
2. $c$ and $f$ are non-zero
1. $1$
2. $2$
3. $3$
4. $4$

1