What is the smallest positive (not including 0) representable number in 32-bit IEEE 754 single-precision floating-point? Show the bit encoding and the value in base 10 (fraction or decimal ok).
a. 1.4013×10 ⁻⁴⁵
b. 1.1755×10 ⁻³⁸
c. 1.0000×10 ⁻¹²⁶
d. 1.1111×10 ⁻¹²⁷