What does 'beside the mark' mean?

[Stupy]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #25 "Mark Idioms", question 8

Take no notice of what he said because his comments are beside the mark.

(a) irrelevant
(b) disregarding
(c) distasteful
(d) disturbing

English Idioms and Expressions, Advanced Level

ESL/EFL Test #25 "Mark Idioms", answer 8

Take no notice of what he said because his comments are irrelevant.

Correct answer: (a) irrelevant
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can you explain further the meaning of "beside the mark"? it wil be great if you can cite more examples on how to use this expression. thanks and have a great day..

[Beeesneees]

I haven't heard this expression before, but I would take it to mean that his comments were beside the point - they were irrelevant to the main issue - they bore no importance.
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Cheers m' dears!