Do you know the definition of a leap year? Are you sure? You might like to check on-line. (a) Describe in clear natural language what it means for a year (assumed to be a natural number, like 2023) to be a leap year. (b) Now express that as a function, with argument year and result a Boolean, leap, which takes the value True iff year is a leap year according to (a). (c) Describe in pseudocode an algorithm to calculatge (b). It should input year and output leap. (d) Downcode your algorithm to Python and test it on years 1800, 1900, 2000 and 2400.