Explain the bending moment part please Required information

A pin in a knuckle joint carrying a tensile load $F$ deflects somewhat on account of this loading, making the distribution of

reaction and load as shown in part $($b$)$ of the figure. A common simplification is to assume uniform load distributions, as

shown in part $($c$).$ To further simplify, designers may consider replacing the distributed loads with point loads, such as in

the two models shown in parts $(d)$ and $($e$).$ Given: $a=0\mathrm{.}900in,b=1\mathrm{.}500in,d=0\mathrm{.}900$ in $,$ and $F=3,240lbf.$

Estimate the maximum bending stress and the maximum shear stress due to $V$ for the three simplified models.

The maximum bending stress for the model $(c)$ is

kpsi.

The maximum shear stress for the model $(c)$ is

kpsi. $($Round the final answer to three decimal places.$)$

The maximum bending stress for the model $(d)$ is

The maximum shear stress for the model $(d)$ is

kpsi.

The maximum bending stress for the model $($e$)$ is

kpsi. $($Round the final answer to three decimal places.$)$

The maximum shear stress for the model $($e$)$ is

kpsi.

kpsi. $($Round the final answer to three decimal places.$)$ Compare the three models from a designer's perspective in terms of accuracy, safety. and modeling time.

Multiple Choice

Model $($e$)$ is the safest, simplest, and most accurate

Model $($c$)$ is the safest, simplest, and most accurate

Model $($C$)$ is the safest, simplest, and least accurate

Model $($d$)$ is the safest, simplest, and least accurate