Consider
\[
\text{F}=\frac{1}{2}\left[\begin{array}{cccc}
1 & 1 & 1 & 1 \\
1 & 1 & -1 & -1 \\
1 & -1 & -1 & 1 \\
1 & -1 & 1 & -1
\end{array}\right], \quad x=\left[\begin{array}{l}
2.1 \\
1.2 \\
1.3 \\
2.4
\end{array}\right], \quad y=\left[\begin{array}{c}
0 \\
-1 \\
2 \\
-1
\end{array}\right]
\]
The inner product between $\text{F}x$ and $\text{F}y$ is
- $0$
- $1$
- $-1$
- $-1.2$
- None of the above