Final answer:
All provided options regarding the transcript header are accurate: it involved English-speaking participants, the child's age, and the play context with the parent.
Step-by-step explanation:
The transcript header provided suggests that the sample includes interactions between a child and a parent during a play context. The language indicated is English, and the child's age is given as 2 years and 3 months. Therefore, all provided options are accurate: the sample was recorded while the child played with his/her parent (Option 1), the participants were English-speaking (Option 2), and the child's age was 2 years, 3 months (Option 3). The correct answer is Option 4: All of the above.