Call a positive integer monotonous if it is a one-digit number or its digits, when read from left to right, form either

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Call a positive integer monotonous if it is a one-digit number or its digits, when read from left to right, form either a strictly increasing or a strictly decreasing sequence. For example, \(3, 23578,\) and \(987620\) are monotonous, but \(88, 7434,\) and \(23557\) are not. How many monotonous positive integers are there?

A. \(1024\)
B. \(1524\)
C. \(1533\)
D. \(1536\)
E. \(2048\)

OA B