True. ML and DL are both subsets of AI, but DL is a specific subset of ML (not all ML is DL), as DL uses multiple ML algorithms together to train on vast data.
Source: Chapter 2, Section 2.1 – Revisiting AI, ML, DL
---
The Venn diagram in the textbook shows AI as the outermost circle, ML inside it, and DL as the innermost circle within ML. This confirms: all DL is ML, but not all ML is DL. Examiners expect you to state "True" and briefly justify using the subset relationship.