Provide the full names of the following plant growth regulators:
$(1)$ $NAA$
$(2)$ $IPA$

(N/A) $(1)$ $NAA$ stands for $Naphthaleneacetic \text{ } acid$. It is a synthetic auxin used in agriculture for rooting and preventing fruit drop.
$(2)$ $IPA$ stands for $Indole-3-propionic \text{ } acid$. It is a naturally occurring auxin found in plants that promotes cell elongation and growth.