Convention for C ternary conditional operator

Considering the ternary operator ?: in C, I have found 3 common conventions used with it (specifically for variables, as the convention there with the other areas of formatting I assume applies to non-variable assignment uses of the operator).

Which one of the valid syntaxes below is standard (the most common/proper convention), and is it mentioned in any documentation?

int i;

Different expressions (bool is being used to represent some Boolean expression):

i = bool ? 1 : 0

i = (bool) ? 1 : 0

(bool) ? i = 1 : i = 0 (convention assumes the preferred of the above two)

K&R mentions in chapter 2.11, Conditional Expressions, to advise the second of the two first options, to more easily read the Boolean expression from the rest of the conditional.
K&R, however, does not make any recommendations as to whether, when using the operator with assignments, to prefer the third option, or one of the two previous ones.

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