What is a unique aspect of lipid hormone signaling compared to GPCRs and RTKs?

Lipid hormones activate tyrosine kinase activity like RTKs.

Lipid hormones require a second messenger system like GPCRs.

Lipid hormones are always protein-based like GPCRs.

Lipid hormones can diffuse through membranes to bind intracellularly, unlike GPCRs and RTKs.