De-Broglie explained the Bohr's postulate of quantization by particle nature of electron. (True /False)

According to de Broglie's explanation of Bohr's second postulate of quantisation, the standing particle wave on a circular orbit for n = 4 is given by

De Broglie's Explanation Of Bohr's Second Postulate|Atomic Collision

De Broglie's Explanation Of Bohr's Second Postulate|Atomic Collision

The de-Broglie's wavelength in 1^(st) Bohr's orbit is

which of the following postulates of the Bohr model led to the quantization of energy of the hydrogen atom ?