Which of the following statements is correct, according to the following instance of the relational schema R(X, Y, Z)?

X	Y	Z
1	1	a
1	1	a
2	1	b
3	2	b

Functional dependency $A \to B$ means:

If two rows have the same value of $A$, then they must have the same value of $B$.

Now check each dependency.

For $X \to Y$:

When $X=1$, $Y=1$ in both rows.
When $X=2$, $Y=1$.
When $X=3$, $Y=2$.

So, same $X$ always gives same $Y$.

Therefore, $X \to Y$ is true.

For $X \to Z$:

When $X=1$, $Z=a$ in both rows.
When $X=2$, $Z=b$.
When $X=3$, $Z=b$.

So, same $X$ always gives same $Z$.

Therefore, $X \to Z$ is true.

For $Z \to X$:

When $Z=b$, we have two different values of $X$:

$X=2$ and $X=3$

So, $Z \to X$ is false.

For $Y \to Z$:

When $Y=1$, we get:

$Z=a$ and $Z=b$

So, $Y \to Z$ is false.

For $Y \to X$:

When $Y=1$, we get:

$X=1$ and $X=2$

So, $Y \to X$ is false.

Hence, only $X \to Y$ and $X \to Z$ are true.