Which of the following is a CORRECT statement?

$\left(1\right)2.3056\to 4$ decimals

$10.138\to 3$ decimals

$-7.4671\to 4$ decimals

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4.9765
Answer should have 3 decimals
$\left(2\right)2.38\times 1.0=2.38\to$ answer should have 2 significant digits

$\left(3\right)\frac{8.05}{3.1}=2.59\approx 2.6$ answer should have 2SD

$\left(4\right)1.11-0.1=1.01\approx 1.0$ but is an intermediate step so we keep 1 digit extra

$1.01\times 9.0=9.09\approx 9.1\to$both 1.01 and 9.0 have 2SD