It would be interesting to know when, by whom and in what context, ?: first started being termed as either 'the trinary operator' or 'the ternary operator'?

I just dug through a bunch of old language references including a Kernighain & Ritchie from 1978, Stoustrup from 1986, the Waite's Group ANSI C from 1989 and several others including a Java manual from the late 90's and it is universally referred to as 'the conditional expression'.

Does anyone else know or have a reference on this?