  We construct a single-field model of inflation that achieves remarkable
agreement with Planck and BICEP/Keck cosmological observations. The model, via
the presence of an ultra-slow-roll phase, generates a sizable scalar-induced
gravitational wave (GW) signal at nHz frequencies. We elucidate the distinctive
features of this signal concerning its connection to the recent measurement of
the low-frequency GW background reported by the NANOGrav collaboration.
