[random42_]

These questions are optional, in my experience. I’ve never seen a form in a job application where these were required.

[idlephysicist]

When I elected to not fill them in, HR told me that they would answer the questions for me. This was due to a "limitation of the system".

[canonica]

In my country it's absolutely illegal to ask, no matter if voluntary or involuntary.

[mightymikey]

in the US, it is required top ask, but optional to fill