Consider the following tree diagram: 
Which of the following nodes are parent nodes?
Definitions:
Guidelines
A set of recommended practices, instructions, or rules that aim to streamline particular processes or standards.
Virtual Meetings
Gatherings that take place over the internet using video conferencing software, allowing participants in different locations to meet in real-time.
Face-to-Face Meetings
Direct interactions between individuals in the same physical space, enabling more personal communication and non-verbal cues exchange.
Technologies
The application of scientific knowledge for practical purposes, especially in industry and our daily lives.
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