If it were a personal project, I would consider some fundamental points to take into account when choosing a design option:
It's a functional element
– to fill out before starting routine Maintenance work– could be interpreted to be checked periodically or at least more than once
It's a choice with a certain sensitivity or importance: safety checks
The toggle and the checkbox will show that the item has been checked and found satisfactory. An unchecked checkbox [or a switch in "off" position] will not defintively show the difference between whether an item has been checked and failed, or not been checked.
A pair of Pass/Fail radio buttons can start off empty (unexamined) and then be completed ...
You can try a dropdown (or radio buttons) with clear choices:
Please choose your options:
- A and B
You only have these four options when I understand your post correctly. So don't increase the user's mental load through unusual and complex UI, but provide a simple list, even when it has one item more than the other possible solutions.
Many of the custom home builder sites offer options on their plan viewers. They tackle this swapping the slider control to a stop sign on the mutually exclusive item. Any sub-items appear with the main slider selection.
Mutually exclusive item, with sub-item added:
The way I see this is that you have two exclusive groups of options, it just happens that the second group only contains one option.
Something as simple as the word 'or' will help a lot - that way it's unambiguous as to the grouping.
What I understand from the question is that A, B, and C are independently selectable but selecting C disables A or B.
What is the way to graphically show three selectors where one is linked to the other two?
Or how to graphically show the link:
Note: this was the original answer before the question was updated (see comments).
I think what you essentially have here is two groups. You have the "A and/or B" group, and you have the "C" group.
Only one group can be selected (so use radio buttons). However, if you pick the first "A and/or B" group, then you have sub-...
Instead of thinking of actions as affirmative or negative, the ideal course of action for the series of checkboxes would be to identify what the expected natural state of the newly drafted pages on your CMS.
To draw parallels, unless you specify
<meta name="robots" content="noindex,nofollow">
on a given webpage, it is assumed that ...